The utility model provides a novel mechanical seal and belongs to the technical field of seals. The novel mechanical seal solves the problem that due to the defect of the structure of an existing mechanical seal, a spring is corroded or blocked due to the viscosity of media or fibers in the media. The mechanical seal comprises a fixed ring assembly, a movable ring assembly, a pump body and a shaft. The fixed ring assembly is in close fit with the pump body. The movable assembly is closely matched with the shaft. The movable ring assembly comprises a transmission sleeve, a spring base and a movable ring. The transmission sleeve is transversely provided with a first transmission pin penetrating through the transmission sleeve, and the transmission sleeve is closely matched with the spring base through the first transmission pin. A spring is arranged between the spring base and the transmission sleeve. The first transmission pin is arranged in the spring in a sleeved mode. A movable ring sealing ring is arranged in the movable ring in a sleeved mode. The mechanical seal has the advantages that the spring does not make direct contact with the media, and the service life of the mechanical seal is prolonged.