The invention relates to the technical field of indoor design equipment, in particular to a decoration waste treatment device for indoor design. A servo motor is adopted for driving a first gear to rotate, on one hand, a first connecting rod acts on the right end of an L rocker arm, the L rocker arm does swing with the bending end hinge point as the circle center, the left end of the L rocker armswings up and down, a third connecting rod acts on a first lifting rod, in cooperation with a first kind of spring, the first lifting rod drives a breaking end on the bottom end to move up and down, the plastic waste in a smashing box can be crushed, on the other hand, a second gear is driven to rotate, a second connecting rod drives the smashing box to do left and right reciprocating moving, theaction area of the breaking end can be changed, the left end of the L rocker arm swings up and down, meanwhile, a fourth connecting rod drives a first piston plate to move up and down, a second pistonplate moves in a following manner, a second lifting rod is driven to lift, and the breaking end on the bottom end can crush the plastic waste in the smashing box.