Energy-saving drying device for compressed air

The invention discloses an energy-saving compressed air drying device, and belongs to the technical field of compressed air dryers, the energy-saving compressed air drying device comprises a shell, an air inlet pipe is rotationally connected to the shell, a connecting pipe is arranged on the side, away from the shell, of the air inlet pipe, a connecting device is arranged on the air inlet pipe, and the connecting device comprises a connecting ring, a rotating ring, an inserting block and a fixing ring; the connecting ring is fixedly connected to the air inlet pipe, the fixing ring is fixedly connected to the connecting pipe, the rotating ring is rotationally connected to the fixing ring, the inserting block is fixedly connected to the rotating ring, an inserting groove is formed in the connecting ring, and the inserting block is matched with the inserting groove in an inserting mode; the connecting device further comprises a positioning mechanism used for fixing the fixing ring after the inserting block is in