Air supply unit

The disclosure provides an air supply unit, the air supply unit provided in the disclosure includes a bearing seat, a drying mechanism, an air storage mechanism, an air supply mechanism and a control valve assembly; the air supply mechanism is connected with one end of the bearing seat, an air channel is formed in the other end of the bearing seat, and the control valve assembly is provided on one end of the bearing seat where the air channel is formed, and communicates with the air channel; and the drying mechanism is provided in the bearing seat, the air storage mechanism is sleeved on one end of the bearing seat that is provided with the air supply mechanism, and the air supply mechanism is located in the air storage mechanism.