Perpendicular positioning device for carrier rocket and use method of perpendicular positioning device

The invention discloses a perpendicular positioning device for a carrier rocket and a use method of the perpendicular positioning device. The device comprises a jacking oil cylinder and a supporting seat. The supporting seat is rectangular, and a conical groove is formed in the middle of the top end of the supporting seat. A top cover matched with the conical groove is clamped in the conical groove. The top end face of the top cover is flush with the top end face of the supporting seat. The top cover is used for supporting a supporting leg of the rocket, and the jacking oil cylinder is vertically arranged at the bottom of the supporting seat. The top end of an output shaft of the jacking oil cylinder is fixedly connected with a jacking ball head. The jacking ball head is inserted in a spherical groove formed in the bottom end of the top cover and is locked through a bottom shroud ring. A pressing plate assembly matched with the supporting leg of the rocket is installed on the supporting seat. The perpendicular positioning device is simple in structure, the clearance between the supporting leg of the rocket and a launcher can be reliably eliminated after the rocket is overall erected, the application range is wide, the perpendicular positioning device can adapt to the large-range circumferential error of erection of the rocket, stability is high, the device can be repeatedly used, and reliability and safety are high.