A power tool comprising: a tool accessory ; a motor configured to drive the tool accessory ; a control module configured to control the motor ; a power supply module configured to provide electric power for the motor and the control module ; and an operating switch , comprising: a trigger mechanism ; a current switch (SW1, SWI') for turning on or off the electrical connection between the power supply module and the motor ; the current switch (SW1, SWI') being coupled to the trigger mechanism to be actuated by the trigger mechanism ; and a signal switch (SW2) at least configured to output a control signal to the control module to control the start of the motor ; the signal switch (SW2) being arranged to connect with the trigger mechanism and to be actuated by the trigger mechanism , characterized in that the signal switch (SW2) comprises: a first signal switch (SW2') coupled to the trigger mechanism to be actuated by the trigger mechanism and configured to output a signal to the control module to brake the motor ; and a second signal switch (SW3') coupled to the trigger mechanism to be actuated by the trigger mechanism and configured to output the signal to the control module to start the motor . a tool accessory ; a motor configured to drive the tool accessory ; a control module configured to control the motor ; a power supply module configured to provide electric power for the motor and the control module ; and an operating switch , comprising: a trigger mechanism ; a current switch (SW1, SWI') for turning on or off the electrical connection between the power supply module and the motor ; the current switch (SW1, SWI') being coupled to the trigger mechanism to be actuated by the trigger mechanism ; and a signal switch (SW2) at least configured to output a control signal to the control module to control the start of the motor ; the signal switch (SW2) being arranged to connect with the trigger mechanism and to be actuated by the trigger mechanism , characterized in that the signal switch (SW2) comprises: a first signal switch (SW2') coupled to the trigger mechanism to be actuated by the trigger mechanism and configured to output a signal to the control module to brake the motor ; and a second signal switch (SW3') coupled to the trigger mechanism to be actuated by the trigger mechanism and configured to output the signal to the control module to start the motor . a trigger mechanism ; a current switch (SW1, SWI') for turning on or off the electrical connection between the power supply module and the motor ; the current switch (SW1, SWI') being coupled to the trigger mechanism to be actuated by the trigger mechanism ; and a signal switch (SW2) at least configured to output a control signal to the control module to control the start of the motor ; the signal switch (SW2) being arranged to connect with the trigger mechanism and to be actuated by the trigger mechanism , characterized in that the signal switch (SW2) comprises: a first signal switch (SW2') coupled to the trigger mechanism to be actuated by the trigger mechanism and configured to output a signal to the control module to brake the motor ; and a second signal switch (SW3') coupled to the trigger mechanism to be actuated by the trigger mechanism and configured to output the signal to the control module to start the motor . a first signal switch (SW2') coupled to the trigger mechanism to be actuated by the trigger mechanism and configured to output a signal to the control module to brake the motor ; and a second signal switch (SW3') coupled to the trigger mechanism to be actuated by the trigger mechanism and configured to output the signal to the control module to start the motor . <EOS>