The invention relates to a scrap metal briquetting machine which comprises a machine body and a three-way hydraulic device, wherein an inlet hopper bin is arranged on the top of the machine body, an outlet is arranged in front of the lower part, a door opening device is arranged at the outlet, and the inside part of the machine body is divided into a pre-extrusion cavity, a secondary extrusion cavity and a third extrusion cavity; the three-way hydraulic device comprises a lateral hydraulic device, a vertical hydraulic device and a longitudinal hydraulic device. Scrap metal is extruded in three ways through the three-way hydraulic device, the compression mode is reasonable, the compression force is great, great compression ratio can be achieved, and the compression efficiency is high. The continuous feeding of the hopper bin can be realized, a lateral pusher head can directly enter the next working cycle after resetting, so that the cycle time is greatly saved, and the working efficiency of the machine is high. A groove is adopted between the pusher head and the inner wall of the machine body for cooperation, therefore, better cooperation can be realized, the service life is long, and the security is good.