The invention belongs to the technical field of mechanical engineering smashing equipment, particularly relates to a sand making device capable of smashing material uniformly based on the mechanical engineering technology, and aims to solve the problem that dinas cannot be effectively smashed during the secondary crushing process. According to the scheme, the sand making device comprises a bottomplate, wherein a material smashing box is fixed on the outer wall of the top of the bottom plate through a bolt; a control cabinet is fixed on the outer wall of the top of the material smashing box through the bolt; a processor is welded on the inner wall of one side of the bottom of the control cabinet; and a first motor is welded on the outer wall, far away from one end of the control cabinet, of the top of the material smashing box. The sand making device can collide and extrude dinas for the first time to enable the dinas to become smaller, the fine dinas can be filtered to enable the dinas to enter a second smashing chamber, and the dinas is smashed for the second time to meet the actual demand; and different smashing rotating speeds can be outputted to smash the dinas, and the sand making device can smash the dinas for the third time to enable the dinas to become smaller and finer.