Multi-stage protector of lifting pump and use method of multi-stage protector

The invention belongs to the technical field of protectors, and particularly relates to a lifting pump multi-stage protector which comprises a lifting pump body, an annular frame is fixedly connected to the outer side of the lifting pump body, a lower tubing coupling is connected to the outer side of the lifting pump body in a sleeving mode, the lower tubing coupling is in lap joint with the top of the annular frame, and four studs are movably arranged on the lower tubing coupling in a penetrating mode. Through the combined action of the lower inner cylinder, the lower opening and closing device, the upper inner cylinder and the upper opening and closing device, the lifting pump body is sealed, double-layer protection is adopted, the sealing probability is improved to 100% from original 85%, the abrasion service life of the two-stage opening and closing device is doubled compared with that of a single-stage opening and closing device, various sundries coming out of the pump in a well and various sundries fall