The invention discloses a multi-grade garbage separation device beneficial to environmental protection. The multi-grade garbage separation device comprises a box body, a screen mesh and an air blower,wherein a first baffle plate is mounted in the box body; a servo motor is mounted above a first mounting plate; a rotary shaft is mounted at the inner side of a bearing; the screen mesh is mounted onthe surface of a second mounting plate; a hydraulic cylinder is mounted on the surface of a mounting frame; a material pressing plate is mounted at an output end of the hydraulic cylinder; a second electric heating tube is mounted in a third baffle plate; a compression cavity is formed in the box body of one side of the third baffle plate; a first electric heating tube is mounted in the box bodyat one side of the compression cavity; a supporting plate is mounted at the bottom of the box body below the compression cavity; the air blower is mounted on the surface of the box body. According tothe multi-grade garbage separation device disclosed by the invention, the air blower, the screen mesh, the servo motor, the compression cavity, the hydraulic cylinder, the material pressing plate, thefirst electric heating tube and the second electric heating tube are arranged, and the problems that garbage cannot be separated completely and the volume of solid garbage is too great are solved.