A double-shaft variable propeller pitch electric bolt-tightening machine, comprising: a base body front end, a base body rear end, a servomotor, a servo rotating table, and a servo feeding table, characterized by a pneumatic device, a main machine base, a lifter, a lift adjusting guide rod, supporting rods, a lift platform, an angle adjusting meter, a bearing platform, a rotary servomotor, an output rotating shaft, a centring device, a rotating arm, a sliding lead screw, a tightening servomotor, and an automatic nut-identification and reaction force device; wherein, the servomotor and the servo rotating table are disposed at the base body front end, and the servo feeding table is disposed at the base body rear end; the pneumatic device is disposed at a distal end of the servo feeding table on which the main machine base is fixed; the lifter is disposed on the main machine base, and the lift adjusting guide rod is fixed on the lifter and is positioned at an upper portion of a top surface of the main machine base; the supporting rods are disposed at the top surface of the main machine base, and the lift platform is fixed on the lift adjusting guide rod and the supporting rods; the angle adjusting meter and the bearing platform are disposed on the lift platform; the rotary servomotor is disposed on the bearing platform and is connected with the output rotating shaft; the centring device and the rotating arm are disposed on the output rotating shaft; the rotating arm is provided with the sliding lead screw on which the tightening servomotor is disposed; and the tightening servomotor is connected with the automatic nut-identification and reaction force device. a base body front end, a base body rear end, a servomotor, a servo rotating table, and a servo feeding table, characterized by a pneumatic device, a main machine base, a lifter, a lift adjusting guide rod, supporting rods, a lift platform, an angle adjusting meter, a bearing platform, a rotary servomotor, an output rotating shaft, a centring device, a rotating arm, a sliding lead screw, a tightening servomotor, and an automatic nut-identification and reaction force device; wherein, the servomotor and the servo rotating table are disposed at the base body front end, and the servo feeding table is disposed at the base body rear end; the pneumatic device is disposed at a distal end of the servo feeding table on which the main machine base is fixed; the lifter is disposed on the main machine base, and the lift adjusting guide rod is fixed on the lifter and is positioned at an upper portion of a top surface of the main machine base; the supporting rods are disposed at the top surface of the main machine base, and the lift platform is fixed on the lift adjusting guide rod and the supporting rods; the angle adjusting meter and the bearing platform are disposed on the lift platform; the rotary servomotor is disposed on the bearing platform and is connected with the output rotating shaft; the centring device and the rotating arm are disposed on the output rotating shaft; the rotating arm is provided with the sliding lead screw on which the tightening servomotor is disposed; and the tightening servomotor is connected with the automatic nut-identification and reaction force device.