Liver metastasis is a common complication in colorectal cancer (CRC), with its presence and progression significantly shortening patient survival. Therefore, a deeper understanding of the underlying mechanisms driving liver metastasis in CRC is essential to identify more effective and actionable therapeutic targets and improve prognosis. Liver metastasis in CRC is a multifaceted and dynamic process. Tumor cells with invasive properties communicate with the surrounding microenvironment through mechanisms such as immune checkpoint molecules and cytokines, thereby establishing a supportive niche for their colonization and proliferation. Moreover, suppressive immune cells may enhance the invasiveness of tumor cells. The interplay between tumor cells and the microenvironment is an interdependent process. Targeting these interactions offers promising potential for novel therapeutic strategies. The present review outlined mechanisms of colorectal cancer liver metastasis, emphasizing the immune microenvironment's role, current treatment approaches, and future development prospects.