The invention relates to a fat
grinding instrument which comprises a fat
grinding instrument body, the fat
grinding instrument body comprises two oppositely-arranged first frame bodies, first arc faces are arranged on the sides, facing each other, of the first frame bodies, movable first
massage assemblies are arranged on the first frame bodies, the fat grinding instrument body further comprises a driving part, and the driving part is arranged on the first frame bodies. The driving part is in transmission connection with the two first
massage assemblies. According to the fat grinding instrument, the same driving part is arranged to drive the two first
massage assemblies to move, so that the space for additionally arranging the driving part is saved, the fat grinding instrument body can be arranged to be lighter and thinner, the size is reduced, and a user can conveniently store and carry the fat grinding instrument body; therefore, the massage effect of the fat grinding instrument on different areas of the same dimension can be more easily kept consistent, and the body building effect is improved.