The invention relates to a protection circuit of a
laser therapeutic instrument and the
laser therapeutic instrument. The protection circuit comprises at least one state detection module, a
logic module and a control module, the input end of the state detection module is connected with a
laser therapeutic instrument
peripheral key state
signal, the output end of the state detection module is connected to the first input end of the
logic module, the second input end of the
logic module is connected with a laser therapeutic instrument master
control signal, and the output end of the logic module is connected to the input end of the control module. The output end of the control module provides power for the optical
shutter of the laser therapeutic instrument. The existing
software is replaced by the hardware
circuit design, the laser output state is rapidly controlled, the logic calculation time is shortened, the use experience of a user is ensured, and the safety of laser output is improved.