Driving circuit used for laser

The invention discloses a driving circuit applied to a laser, and relates to the field of laser welding. The driving circuit is connected with the laser, and includes a pre-stage pump source, a current control unit and a connection terminal. The other end of the connection terminal is connected with the laser. After the pre-stage pump source sends a current signal to the positive electrode of theconnection terminal, the negative electrode of the connection terminal transmits the current signal to the current control unit, and the current control unit is configured to control the current in the current signal to be constant, acquires and processes the current of the current signal, and feeds back the current to the pre-stage pump source. The output voltage of the pre-stage pump source is changed along with the change of the current. According to the invention, the current control unit reliably controls the output voltage of the pre-stage pump source to accurately control the driving current, so the driving cur