The invention provides a multifunctional protection device for a unit, a rod and a pump. The multifunctional protection device for the unit, the rod and the pump comprises a cylindrical worm-wheel shaft (4), a first-stage worm input shaft (3) and a second-stage worm shaft (6); a worm section and a worm gear (10) are arranged on the second-stage worm shaft (6); a worm on the first-stage worm input shaft (3) is in worm gear and worm connection with a worm gear on the second-stage worm shaft (6); the worm section on the second-stage worm shaft (6) is in worm gear and worm connection with the worm gear on a worm gear shaft body (4). The multifunctional protection device for the unit, the rod and the pump further comprises a protector housing (7). According to the multifunctional protection device for the unit, the rod and the pump, the worm gear shaft body and a frictional body can be operated to drive a square clamp to rotate so as to drive the polishing rod, the pumping rod and a pump plunger piston to rotate at a constant speed when a polishing rod moves up and down; therefore, deviation-caused wearing can be avoided, the pump inspection cycle can be prolonged, and as a result, the service life of the pumping unit can be prolonged.