Handheld angle grinder and hand-releasing power-off device thereof

The invention belongs to the technical field of machine manufacturing, and particularly relates to a handheld angle grinder and a hand-releasing power-off device thereof, and the hand-releasing power-off device comprises a main control circuit arranged on the handheld angle grinder and a receiving control circuit arranged on a power supply unit of the handheld angle grinder. The main control circuit comprises a detection module used for detecting whether the handheld angle grinder slips out of the hand or not when the handheld angle grinder works, a main controller connected with the detection module in a sampling mode and a communication transmission module, and the receiving control circuit comprises a communication receiving module and a power-off module, so that after a power-off execution control signal transmitted by the main control circuit is received, the communication receiving module receives the power-off execution control signal. And the power supply of the power supply unit of the handheld angle