The invention relates to a waste compressor, belonging to the technical field of pre-pressed typed waste treatment compression equipment. The anterior segment of the waste compressor is a storage tank and the posterior segment of the waste compressor is a compressor shell body, and the storage tank and the compressor shell body are articulated by a connector; a weighing device is installed below the storage tank; a gate is arranged on the front end surface of the storage tank, two lift cylinders of the gate are respectively installed at two sides of the front end of the storage tank, and the piston rods of the cylinders of the gate are fixedly arranged at two sides of the gate; a compression head is arranged inside the compressor shell body, the front end flange of the piston rod of the compression cylinder is connected with the compression head by bolts and a cylinder base is connected on the bottom plate of the compression shell body. The invention solves the problem of inability to unload materials when weighing at waste stations, thus improving working efficiency; the waste compressor adopts split typed structure, thus guaranteeing the accuracy of waste weighing in the storage tank in one respect and assuring the waste compressor of more convenient processing, transportation, use and maintenance in another respect.