The invention discloses a machine for automatically deforming and classifying medical waste and its use method, which includes a first collection bucket, a control assembly and a cutting assembly, a second collection bucket is connected to the right side of the first collection bucket, and the second collection bucket The left and right sides of the interior of the two collection barrels are symmetrically equipped with fixed plates, the control assembly is arranged on the left side of the fixed plate, and the control assembly includes a controller, an infrared radiation sensor and a micro air pump, and the inside of the fixed plate is installed with controller, and the input end of the controller is connected with the infrared radiation sensor, the output end of the controller is connected with a micro air pump, the cutting assembly is installed on the right side of the micro air pump, and the right side of the cutting assembly is provided with a safety Protective components. The invention is divided into four collection buckets, which is beneficial to classify medical waste reasonably, facilitate later recycling, realize automatic separation of needles and infusion bags, greatly release the hands of medical staff, and reduce their daily workload.