The utility model discloses a screwdriver with a high-voltage alternating current detection device. Including a housing, a rear end cover is arranged at one end of the shell; a front end cover is arranged at the other end of the shell; battery arranged in shell, a protection plate is arranged at the top of the battery; the protection plate is positioned in the shell; motor arranged in shell, the motor is arranged on one side of the battery; a reduction gearbox is mounted on an output shaft of the motor; an output rotating shaft is arranged on the reduction gearbox; the output rotating shaft penetrates through the front end cover and extends to the outer side of the shell; a detection device is arranged in the shell and movably arranged on the output rotating shaft in a sleeving mode, clamping grooves are formed in the top and the bottom of the detection device respectively, first grooves are formed in the inner wall of the top of the shell and the inner wall of the bottom of the shellrespectively, clamping pins are installed in the first grooves in a sliding mode, and the clamping pins and the clamping grooves are installed in a clamped mode. The detection device is reasonable indesign, simple in structure, convenient to operate, convenient to disassemble and convenient to maintain.