The invention relates to an electric hammer. The electric hammer comprises a housing, a knob and a transmission shaft, wherein the knob is arranged on the outer wall of the housing, the transmission shaft is arranged in the house and connected with a motor shaft. An intermediate shaft with a first outer spline fixed is arranged in the housing, a swing rod bearing is fixed on the intermediate shaft, a fixed spline is fixed on the transmission shaft, the transmission shaft is sleeved with a transmission part with a second outer spline at an interval, the first outer spline and the second outer spline are arranged on two sides of the fixed spline respectively, a first spline housing and a second spline housing are arranged in the housing, the first spline housing can bilaterally move to be matched with the first outer spline and the fixed spline, and the second spline housing can bilaterally move to the matched with the second outer spline and the fixed spline. The knob is connected with an eccentric pin extending to the first spline housing and the second spline housing. The eccentric pin is driven to rotate by rontation of the knob, so that the two spline housings are driven to be matched with or separated from the fixed housing on the transmission shaft, and power distribution of the transmission shaft is controlled; different components are driven to work by the two spline housings, so that the electric hammer has different functions and is simple in structure and convenient to switch functions.