Mechanical sealing device for pump

The utility model discloses a mechanical sealing device for a pump. The mechanical sealing device for the pump comprises a static ring, a moving ring, an elastic device, a transmission device and an elastic sealing device; the transmission device is sleeved on a shaft; the elastic sealing device is arranged between the transmission device and the shaft; a fastening bolt and an elastic device are arranged in the direction vertical to the shaft along the circumference of the transmission device; the moving ring is sleeved on the outside cylindrical surface of the section, extending to the moving ring, of the transmission device and can move backward and forward along the cylindrical surface of the transmission device; the moving ring and the outside cylindrical surface are sealed by the elastic sealing device; the static ring is in frictional contact with the moving ring; an annular step is formed inside the static ring; the moving ring and the transmission device form an annular sealing groove inside the movin