Objective To determine the role of AAMP in osteosarcoma cells and explore the mechanism of invasion and metastasis of osteosarcoma cells regulated by AAMP through the YAP signaling pathway. Methods Public sequencing data analysis was used to explore the correlation between AAMP and osteosarcoma. q-PCR, Western blot, and immunohistochemistry were used to detect the expression levels of osteosarcoma cell-related molecules. CCK-8 was used to detect cell proliferation ability. Transwell and wound healing assays were used to detect the invasive and metastatic abilities of osteosarcoma cells. Immunofluorescence was used to detect the cell localization and expression levels of related molecules. Results High expression of AAMP was negatively correlated with the prognosis of patients with osteosarcoma (P<0.05), and the expression of AAMP in patients with metastatic osteosarcoma increased (P<0.05). Compared with the control group, the AAMP interference group showed significantly decreased migratory, invasive, and EMT activities (P<0.05). The expression of p-CFL1 reduced after the knockdown of AAMP, and the cell plate pseudopods decreased significantly (P<0.05). A positive correlation was found between the expression levels of AAMP and YAP in osteosarcoma cells (P<0.05). Interfering with YAP expression can affect the migration and invasion of osteosarcoma cells. Conclusion AAMP promotes osteosarcoma cell metastasis by regulating the YAP signaling pathway, suggesting that AAMP may be a key molecule in promoting invasion and metastasis of osteosarcoma.