The invention discloses a compression device for garbage recycling, which comprises an unloading door, a connecting head, a rotary shaft, an electric flexible od, a metal joint, an electromagnet, a handle, a cover plate, a graphite brush, an external electric wire, a hydraulic rod, a bracket, a slide block, a cylinder body, a sewage collecting room, a blowdown pipe, a discharging opening, a feeding opening, a filter screen and a through hole. The invention has the beneficial effects that the garbage is poured in the cylinder body through the feeding opening, and then the seal cover is coveredon the feeding opening; the bracket is driven to leftwards move through the hydraulic rod, thus the bracket can drive the slide block to move leftwards and the slide block can compress the garbage; when the slide block is moved leftwards, the graphite brush at the inner part of the slide block can continuously contact with the metal joint, the external power source can orderly provide energy source for the electromagnet through the external wire, the graphite brush and the metal joint, thus the electromagnet can absorb the cover plate.