〔Abstract〕 Objective To explore the role and mechanism of long noncoding RNA(lncRNA) AC005062.1 in colorectal cancer(CRC) cell proliferation and apoptosis. Methods The analysis of GSE84983 and GSE 104364 was used to indicate the expression level lncRNA AC005062.1 in CRC. The tumor tissues(tumor group) and adjacent tissues(control group) of patients undergoing CRC surgery in the hospital tumor surgery department were collected. Eight pairs of tissues were randomly selected, and qPCR was used to detect the expression of lncRNA AC005062.1 in CRC tissues and paired adjacent tissues in the two groups. After using siRNA to down-regulate the expression of lncRNA AC005062.1 in CRC cells, CCK-8 assay was used to detect cell proliferation in two groups, flow cytometry was used to detect cell cycle and apoptosis in two groups, wound scratch test was used to detect cell migration in two groups, and the lncRNA was determined. The database was used to compare the localization of lncRNA AC005062.1 and MACC1 genes on staining. The expression levels of MACC1 transcription and protein levels in the control group and tumor group were detected by qPCR and Western blot, respectively. The lncRNA AC005062.1 in CRC cells was down-regulated, and the expression levels of MACC1 transcription and protein levels in the two groups of cells were detected by qPCR and Western blot, respectively. Results The database analysis of GSE84983 and GSE104364 and the detection results of the two groups indicated that the lncRNA AC005062.1 was highly expressed in CRC. After down-regulation of lncRNA AC005062.1, the results of CCK-8 experiments showed that the proliferation rate of HT29 cells in the down-regulation group decreased. Flow cytometry showed that the number of apoptosis of HT29 cells in the down-regulated group increased, the proportion of G1 phase increased, and the proportion of S phase and G2 phase decreased. Western blot experiments showed that the expressions of cleaved-caspase3 and Bax in the down-regulated HT29 cells increased, while the expression of Bcl-2 decreased. Wound scratch experiments showed that the migration rate of HT29 cells in the down-regulated group was lower than that in the control group. The analysis of UCSC to compare the location of lncRNA ac005062.1 and MACC1 on chromosomes showed that they were located very close together. MACC1 was highly expressed in CRC and down-regulated lncRNA AC005062.1 expression in HT29 cells could reduce the expression of MACC1. Conclusion lncRNA AC005062.1 can inhibit the proliferation, cycle and migration of HT29 cells, and promote its apoptosis by regulating the expression of MACC1 in CRC.