Door locking device of dyeing machine

A door locking device of a dyeing machine comprises an operation ring, a plurality of sealing plates, a sealing ring and a cantilever. The door locking device is arranged between a tank cap and a tank, the tank cap is hinged with the tank body, the cantilever is arranged on the tank cap, the cantilever protrudes the tank cap and is connected with a driving device, the sealing ring is arranged on the tank cap, the sealing plates are hinged to the sealing ring, a groove is arranged in each sealing plate, on end of each connecting rod is embedded in the corresponding groove while the other end isconnected onto the operation ring, and an annular groove matched with the sealing plates is arranged in the upper end of the tank. The tank and the tank cap are located through the adjustable sealingplates, so that the high temperature-pressure dyeing machine is good in sealability, high temperature-pressure operation environment and stability of dyeing effect are guaranteed, cap opening is facilitated, and the situation