A 1,4-cyclohexanedimethanol trans-isomer purification method includes steps: (1) dissolving a 1,4-cyclohexanedimethanol cis-and trans-isomer mixture into an acetone or ethyl acetate solvent to obtain raw material solution; (2) adding the raw material solution into a crystallizer preheated to 45-55 DEG C; (3) growing, namely gradually cooling the crystallizer to a final temperature; (4) after growing is finished, discharging uncrystallized residual raw material solution out of the crystallizer; (5) sweating, raising the temperature of the crystallizer by a heating rate of 3-10 DEG C/h so as to raise the temperature of a crystallization layer to enable melting and discharging of impurities on the crystal surface; after the temperature reaches 45-55 DEG C, performing constant-temperature sweating for 4-6h; (6) heating the crystallizer to a temperature above 60DEG C to completely melt the crystallization layer, and collecting high-content 1,4-cyclohexanedimethanol trans-isomer.