The invention discloses a combined marker for early diagnosis of liver cancer and its application. The combined markers for early diagnosis of liver cancer disclosed in the present invention are FAM78A, MKL1, DCDC2, SR, BCL2L11, CYP1B1, PTPN7, AXIN1, SEMA4D, PROX1, SHH, AK055957, DAB2IP, TBX15, GRASP, PPFIA1 and / or PSD4. Methylation, and mutation of TERT and / or CTNNB1. The present invention performs liver cancer detection by detecting the methylation level of the gene combination in the plasma cfDNA, and has high sensitivity and specificity; in the case of adding the mutation detection of the gene, by simultaneously detecting the methylation of the gene combination and the TERT gene , CTNNB1 gene mutation, effectively improve the sensitivity of early screening.