Carrier rocket erection frame rear end locking device

The invention provides a carrier rocket erection frame rear end locking device which comprises a support, a supporting arm, a lifting seat, a clamping mechanism and a supporting mechanism. The supporting arm is arranged at one end of the supporting seat, the lifting seat is vertically mounted on the support through bolts, the clamping mechanism is mounted at the upper end of the lifting seat, the supporting mechanism is mounted at the upper end of the supporting arm, and the upper end of the supporting arm is connected with the clamping mechanism through the supporting mechanism. Requirements on positioning accuracy of a rocket are met through a linkage mechanism by adjusting various degrees of freedom; the position of a positioning pin is enabled to adapt to requirements of the rocket by adjusting extension and contraction length of a left adjusting screw and height of a lifting screw, a ball nut is used to enable left and right arc pressing plates to clamp the clamping pin, then the objectives of high-accur