The invention relates to the technical field of air purification, in particular to an air purification control method applied to a workshop. The method is realized based on an air purification device.The air purification device comprises an air injection pipe in a square pipe shape, the air injection pipe is provided with a guide device, a pressure device and a control device, the guide device islocated in an inner cavity of the air injection pipe, a square exhausting hole is formed in the part, located on the side of the guide device, of the air injection pipe, one end of the guide device is in transmission connection with the pressure device, the pressure device penetrates through the side wall of the air injection pipe, the control device is arranged on one side of the pressure device, and the guide device comprises a rotary shaft, a separating plat and herringbone teeth. Through stable pneumatic control, the flowing direction of airflow in the air injection pipe is realized, toohigh air pressure in the workshop is avoided, and the too high air pressure does not have great influence on the whole purification work, so that energy loss and waste are avoided through an airflow transferring method, and the effects of saving energy and protecting the environment are achieved.