The invention discloses a vacuum system capable of using heat generated by concentrated tail gas. The system comprises an evaporation chamber, a vacuum device, several tail gas heaters and several material inlet pipes. The evaporation chamber comprises a tank body and a spherical baffle plate. The top end of tank body is provided with an air extraction hole. The spherical baffle plate is located in the tank body and is placed squarely below the air extraction hole. The bottom of the tank body is provided with material outlets. The lateral side of the tank body is provided with material inlets, an inlet material observation hole and a fluid level observation hole. Viewing glass is placed at both the inlet material observation hole and the fluid level observation hole. The vacuum device is communicated with the air extraction hole of the evaporation chamber. The material outlets of several tail gas heaters pass through several material inlet pipes to communicate with the material inlets of the evaporation chamber. Each of the material inlet pipes is provided with a material inlet valve. The system can effectively utilize the heat generated by the tail gas. On the premises of increasing the concentrated output of tail gas, the system has the advantage of having no new additional energy consumption, being simple in operation and having a straightforward control manner.