The present disclosure discloses an electro-optic Q-switching double-frequency double-pulse laser lithotripsy system, relates to the technical field of laser medical appliances, and solves a problem that a laser lithotripsy system capable of crushing different sizes of stones safely, having a high electro-optic efficiency and easy to change a pulse width lacks in the conventional art. The system includes a total reflection mirror, an electro-optic Q-switching assembly, a drive circuit, a controller, a pump source, a gain medium, an output mirror, a first focusing mirror, a frequency doubling crystal, a second focusing mirror, a coupling lens and an output optical fiber； the electro-optic Q-switching assembly and the gain medium are located between the total reflection mirror and the output mirror； and the controller controls the pump source to work, and controls a voltage of the electro-optic Q-switching assembly by controlling the drive circuit, so that the system outputs a double-frequency laser beam with a pulse width of 1-1.5 µs or 200-300 µs. The present disclosure can crush a stone with a large size, can also implement cutting of a soft tissue around the stone, and is high in electro-optic efficiency, easy to change a pulse width and applicable to clinical use.
