The invention discloses a snow block compacting machine for snow sculptures. The snow block compacting machine for the snow sculptures comprises a snow compacting cavity and an upper plate, wherein one end of the snow compacting cavity is open, and the upper plate is movably arranged in the position of the opening. At least one upper plate hydraulic cylinder and at least one supporting piece are arranged on the outer side wall of the snow compacting cavity. At least one connecting piece movably connected with piston rods of the upper plate hydraulic cylinders is arranged on the outer wall of the upper plate correspondingly. The supporting pieces are movably connected with the corresponding connecting pieces. The outer walls of the two opposite sides of the snow compacting cavity are each provided with a pressing plate hydraulic cylinder. A pressing plate is movably arranged in the snow compacting cavity. Piston rods of the two pressing plate hydraulic cylinders are connected with the pressing plate through connecting assemblies. The snow block compacting machine for the snow sculptures has the beneficial effects of being convenient to use and high in working efficiency.