The utility model discloses a vacuum drainage device. The vacuum drainage device comprises a water pump (1), wherein a water inlet pipe (2) is arranged on the water pump (1), a vacuum drainage branch pipe (3) is connected to the position, close to the water pump (1), on the water inlet pipe (2), an air and water separation valve (4) is arranged at the tail end of the vacuum drainage branch pipe (3), the tail end of the vacuum drainage branch pipe (3) is further connected with a vacuum tank (5) through a guide pipe, a pressure gauge with an electric contact (6) is arranged on the vacuum tank (5) and connected with a controller, the controller is connected with two vacuum pumps (8) through relays, the vacuum tank (5) is connected with the vacuum pumps (8) through bleeding pipes, and the two vacuum pumps (8) are both connected with a water tank (10) through a pipe (9). According to the vacuum drainage device, because the vacuum tank, the pressure gauge with the electric contact and a power distribution control box are arranged, a certain negative pressure can be kept in the vacuum tank, the pipes are filled with water all the time, and the water pump can be started at any time.