The invention relates to the technical field of live pig slaughtering, in particular to a live pig slaughtering system, which reduces the use of manpower, improves the effect of unhairing live pigs, improves the efficiency of live pig slaughtering and improves the practicability. The live pig slaughtering system includes steam boxes, high-pressure steam sprayers, a bottom plate, a vertical frame, an incomplete bevel gear, a complete bevel gear, a first rotating shaft, a bearing seat, a chain wheel, a chain, a hook, a guide mechanism, a hair removing mechanism, a power mechanism and an adjusting mechanism; control panels are arranged on the steam boxes, the multiple sets of high-pressure steam sprayers are installed in the two sets of steam boxes respectively, and the vertical frame is fixedly installed on the bottom plate; the power mechanism is installed on the bottom plate, the incomplete bevel gear is installed at the output end of the power mechanism, the complete bevel gear is in meshed connection with the incomplete bevel gear, the complete bevel gear is installed on the first rotating shaft, the bearing seat is fixedly installed on the bottom plate, the first rotating shaft is rotationally connected with the bottom plate through the bearing seat, and the chain wheel is installed on the first rotating shaft. The chain is installed on the chain wheel.