The utility model relates to a workover technical field especially relates to a power swivel. Power swivel includes: water supply connector, first motor, second motor, first driving gear, second driving gear, driven gear, main shaft and magenetic exchange valve. The main shaft is hollow structure, the water supply connector with the upper end of main shaft links to each other to accessible drilling fluid is communicated with each other with the center of main shaft. The center of driving gear links firmly on the output shaft of motor, driven gear's center links firmly on the main shaft, driven gear with initiative gear engagement. Motor drive driving gear, power pass through driven gear and transmit the main shaft, connect the drilling tool on the main shaft, can creep into the operation. The positive reverse rotation of the steerable main shaft of magenetic exchange valve. This power swivel chooses for use the big moment of torsion motor drive main shaft of low -speed to rotate, one -level gear reduction, simple structure, easy dismounting.