A combination control assembly of dual fuel internal combustion engine comprises a dial (2) that can be rotated to manipulate operation of a dual fuel internal combustion engine; a turntable (3) includes a disk body (301) and a shift lever (302), characterized in that the shift lever (302) is settled on the disk body (301); a first rotating part (4) that can be rotated by cooperating with the shift lever (302); a second rotating part (9) that can be rotated by cooperating with the shift lever (302); a first fuel valve (6) opened by the first rotating part (4), a second fuel valve (11) opened by the second rotating part (9). The combination control assembly controls the first fuel valve (6) and the second fuel valve (11), simplifying the manual operation and keeping the engine runs stable.