Leakage-proof device for drying tower of air dryer

The utility model provides a leak-proof device of an air dryer suction drying tower, which comprises a PLC control system, a local controller and two suction drying towers connected through a connecting pipe, the bottom of each suction drying tower is provided with an air inlet valve and a release valve, the top of each suction drying tower is provided with a one-way valve, and the two suction drying towers are connected through a connecting pipe. The end, away from the drying tower, of the release valve is connected with an exhaust main pipe, the exhaust main pipe is provided with a pressure switch electrically connected with the release valve, and the end, away from the release valve, of the exhaust main pipe is provided with a silencer. The pressure switch is additionally arranged on the exhaust main pipe, when the pressure of the exhaust main pipe reaches an action threshold value, the suction drying tower release valve is closed in an interlocking mode, and the situation that a large amount of air leaks