A laser emitting circuit, comprising an energy charging circuit, an transfer circuit and a plurality of energy release circuits (203... 20n), the plurality of energy release circuits connected in parallel, wherein the energy charging circuit is connected to the energy transfer circuit and is configured to store electric energy; the energy transfer circuit is connected to the energy charging circuit and the energy release circuits, and configured to transfer the electric energy stored in the energy charging circuit to the energy release circuits, and the energy transfer circuit comprises an energy storage capacitor and a floating-ground diode, wherein a first terminal of the energy storage capacitor is connected to the energy charging circuit, the first terminal of the energy storage capacitor is connected to the energy release circuits, a second terminal of the energy storage capacitor is grounded via the floating-ground diode, and the second terminal of the energy storage capacitor is connected to the energy release circuits; each energy release circuit is configured to drive a laser diode (LD1... LDn) to emit light by means of the electric energy stored in the energy transfer circuit, each energy release circuit comprises an energy release switch element (Q1... Qn), the laser diode (LD1... LDn) and a clamping diode (D1... Dn), wherein a first switch terminal of the energy release switch element is connected to the first terminal of the energy storage capacitor, a second switch terminal of the energy release switch element is connected to a positive electrode of the clamping diode, the second switch terminal of the energy release switch element is connected to a positive electrode of the laser diode, a negative electrode of the clamping diode is grounded, and a negative electrode of the laser diode is connected to the second terminal of the energy storage capacitor. the energy charging circuit is connected to the energy transfer circuit and is configured to store electric energy; the energy transfer circuit is connected to the energy charging circuit and the energy release circuits, and configured to transfer the electric energy stored in the energy charging circuit to the energy release circuits, and the energy transfer circuit comprises an energy storage capacitor and a floating-ground diode, wherein a first terminal of the energy storage capacitor is connected to the energy charging circuit, the first terminal of the energy storage capacitor is connected to the energy release circuits, a second terminal of the energy storage capacitor is grounded via the floating-ground diode, and the second terminal of the energy storage capacitor is connected to the energy release circuits; each energy release circuit is configured to drive a laser diode (LD1... LDn) to emit light by means of the electric energy stored in the energy transfer circuit, each energy release circuit comprises an energy release switch element (Q1... Qn), the laser diode (LD1... LDn) and a clamping diode (D1... Dn), wherein a first switch terminal of the energy release switch element is connected to the first terminal of the energy storage capacitor, a second switch terminal of the energy release switch element is connected to a positive electrode of the clamping diode, the second switch terminal of the energy release switch element is connected to a positive electrode of the laser diode, a negative electrode of the clamping diode is grounded, and a negative electrode of the laser diode is connected to the second terminal of the energy storage capacitor.