A rotary liquid sand blasting machine is composed of a machine body, a secondary vertical planet gear reduction motor, a primary vertical planet gear reduction motor, a belt wheel transmission mechanism, a workpiece fixture, a hopper, a water tank, a rotary one-row one-side two-hole chain, spray guns, opposite type detection switches, photoelectric proximity switches, a synchronous belt, a pen type air cylinder, workpieces, a liquid grinding pump, a conventional mechanical transmission system, a medium power system, a pipeline system and an electronically intelligent PLC program control system, the liquid grinding pump, the conventional mechanical transmission system, the medium power system, the pipeline system and the electronically intelligent PLC program control system are matched withthe rotary liquid sand blasting machine, and the novel rotary liquid sand blasting machine is formed. Compared with the prior art, 1, the problem that a dry type sand blasting machine pollutes the environment is solved, and the worker operation environment is improved; 2, continuous operation is achieved, and the working efficiency is improved; and 3, the rotary liquid sand blasting machine is novel and simple in structure, reliable in function and advanced in structure and has broad application prospects.