Electric tool

The utility model provides an electric tool, comprising a shell, a motor which is arranged in the shell and provides the rotation motion, a transmission gear cluster which is arranged in the shell and is connected with the motor, a torsion control device which is provided with a first knob which adjusts the maximum output torsion value of the transmission gear cluster by rotation and has a plurality of first concave parts at the internal circumferential wall, an impact device which is provided with a second knob which starts or stops the impact motion which is generated on the transmission gear cluster by the rotation and has a plurality of second concave parts on the internal circumferential wall, a positioning device which is provided with a fixed base which is fixed on the torsion control device and a positioning part which is arranged on the fixed base; the positioning part is provided with two elastic lug bosses which respectively push through the first concave part and the second concave part at corresp