The invention relates to a safe electric angle grinder. The safe electric angle grinder comprises a case. The case is internally provided with a speed regulating motor, a motor integrated protector, aspeed reducer, a transmission mechanism and a signal receiving controller. The motor integrated protector is electrically connected with the speed regulating motor. An output shaft of the speed regulating motor is connected with the speed reducer. An output shaft of the speed reducer is connected with the transmission mechanism. The signal receiving controller is fixed to the inner wall of the case and electrically connected with the motor integrated protector. A grinding component is arranged on one side of the case. A protective cover is arranged outside the grinding component. The grindingcomponent is connected with an output shaft of the transmission mechanism. A human induction component is arranged outside the grinding component in the axial direction. A pressing cushion block is arranged outside the human induction component in the axial direction. The human induction component and the signal receiving controller are in induction connection. A speed-regulating control switch is arranged at the tail of the case. A protective switch is further arranged on one side of the tail of the case. The speed-regulating control switch is connected with the protective switch in series.The protective switch is electrically connected with the motor integrated protector. The safe electric angle grinder can protect an operator and the internal motor from injury.