A construction garbage crushing device comprises a frame body, a crushing device, a feeding hopper, a support device, a material collecting device, a material distributing device and a roller, wherein a first support, a concentration block, a first fixing hole and a first through hole are formed in the frame body, the feeding hopper is hollow, the lower surface of the feeding hopper is fixedly connected with the upper surface of the frame body, the interior of the feeding hopper is communicated with the interior of the frame body, the crushing device comprises a first crushing wheel, a first crushing tooth, a second crushing wheel and a second crush tooth, the support device comprises a first cross rod, a second support, a first oblique rod and a first vertical rod, the material collecting device comprises material collecting box, a first supporting rod, a first triangular block and a second triangular block, the material distributing device comprises a jacking block, a supporting frame, a pushing rod, a material distributing frame, an air cylinder, a backing plate, a second supporting rod and a second fixing block, the roller adopts a cylinder, and is horizontally placed, the roller is positioned right below the first through hole, and the construction garbage crushing device provided by the invention can fully crush construction garbage, and the crushing effect is ideal.