A precision actuator with an impact-resistant locking device comprises the impact-resistant locking device, a grating ruler swinging installation block, an extension rod installation head, an extension rod, a driving screw rod, a driving nut, a nut fastening piece, a first motor bearing, a main driving motor, a second motor bearing, a main shell, a motor upper shell and a base. The precision actuator has an impact-resistant locking function, a locking block and the extension rod are locked by a matched groove under a locking state, impact bearing employs a contact form, and the impact-resistant capability can be improved; by employing a fuse mechanism, extra motor control is reduced, and the control difficulty is reduced; and position feedback fully-closed loop is achieved, meanwhile, theextension rod can freely rotate at a small angle, the measurement accuracy cannot be affected, and the actuator is suitably applied to a multi-dimensional gesture adjustment platform.