The invention discloses a scrap briquetting machine used for metal casting. The machine includes a worktable; the edge of the lower end face of the worktable is provided with support legs, the lower ends of the support legs are provided with idler wheels, the upper end face of the worktable is provided with a left vertical plate and a right vertical plate opposite to each other, an outer cylinderbody is arranged between the two vertical plates, an inner cylinder body is arranged in the outer cylinder body, a sound insulation cavity is formed between the outer cylinder body and the inner cylinder body, and a hydraulic cylinder is arranged on the left side face of the left vertical plate. The machine in simple in structure and convenient to use, movement of a device can be achieved, the special production requirements of users are met, the design is more user friendly, noise generated by the briquetting machine in the production process can be reduced to a certain extent, the noise pollution is reduced, the body health of workers is ensured, meanwhile the environment is protected, through a material collection device, the situation that workers need to load and unload materials every time is avoided, the work time is saved, the work efficiency of the users are ensured, and the production efficiency of the briquetting machine is improved.