The high-frequency electrosurgical knife is a medical device that uses high-frequency electrical currents to cut tissue and clot blood. The smoke filtration level can reach 99.999%, which can effectively filter out the smoke generated during the procedure and reduce the harm to doctors and patients. This is achieved through a four-stage high-efficiency smoke filtration system, which uses a suction smoking device to provide multi-stage filtration of smoke in order to minimize pollution to the environment.