Reactor driving device and methodcapable of self-locking and self-releasing

The invention discloses a reactor driving device and method capable of self-locking and self-releasing. The reactor driving device comprises: a shell, wherein a screw rod is arranged in the shell andis used for accessing a motor, a driving device is arranged in the shell, the driving device sleeves the screw rod at intervals, a driving base is arranged at the bottom of the driving device, and a control rod is arranged at the bottom of the driving base; and a fuel assembly used for inserting a reactor core, wherein a limiting plate installed at the bottom of the shell, and a control rod penetrates through the limiting plate and extends to the position below the limiting plate. A closed lead screw nut whole is formed through a lead screw nut clack and abuts against the lead screw, and through the self-locking principle of the lead screw nut whole, the lifting stability and continuity of the driving device are improved; and the rotation direction of the screw rod is controlled through the motor to adjust the lif