The invention discloses a vacuum coating machine. The vacuum coating machine comprises a bottom plate, a diffusion pump and a mechanical pump, wherein supports are fixedly arranged on the left side and the right side of the lower end surface of the bottom plate, a vacuum meter is arranged on the left side of the interior of a cover body, a vent valve is arranged on the right side of the interior of the cover body, electric telescopic rods are arranged on the left side and the right side of the interior of the cover body, the outer surfaces of the upper ends of the electric telescopic rods arefixedly connected with to-be-plated metals at equal intervals, frame bodies are arranged on the inner sides of the electric telescopic rods, motors are fixedly arranged on the right side surfaces of the frame bodies, a fixed disc is arranged on a linkage structure, and a liquid storage tank is fixedly arranged on the right side of the upper surface of the bottom plate. According to the vacuum coating machine, the vacuum state in the cover body can be known and controlled through the vacuum meter, moreover, a cleaning device for the cover body is arranged, so that the coating efficiency is high, the cover body is not required to be repeatedly opened, so that the sealing performance of the machine is good, moreover, assembly and disassembly are convenient, and the design of the cooperative mechanism between the diffusion pump and the mechanical pump is reasonable.