Secondary water-stable mixing plant

The utility model discloses a secondary water-stable mixing plant, which belongs to the technical field of concrete mixing equipment and comprises a mixer, the lower end of the mixer is fixedly connected with a fixing frame, the lower end of the fixing frame is fixedly connected with a guide sleeve, a fixing plug is arranged in the guide sleeve, the upper end of the fixing plug is fixedly connected with the upper portion of the guide sleeve, and the lower end of the fixing plug is fixedly connected with the lower portion of the guide sleeve. A movable cylinder is slidably installed on the lower portion of the fixed plug in a sliding sealing mode, the upper portion of the movable cylinder is slidably embedded in a guide sleeve, so that the movable cylinder is kept in a contraction state, then a rotating frame is screwed to drive a threaded rod to rotate, the threaded rod pushes a sealing plug to backwards enter a communicating pipe, the air pressure in the communicating pipe is increased, and the air pressure