An electro-optic Q-switching double-frequency double-pulse laser lithotripsy system, comprising 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, wherein the electro-optic Q-switching assembly and the gain medium are located between the total reflection mirror and the output mirror; the drive circuit is connected to the electro-optic Q-switching assembly; and the controller is connected to the electro-optic Q-switching assembly and the pump source, the controller controls the pump source to work, and the controller controls a voltage of the electro-optic Q-switching assembly by controlling the drive circuit; and the controller controls the pump source to generate pump light to irradiate the gain medium; the controller controls the drive circuit; when a voltage difference exists on the electro-optic Q-switching assembly, an optical resonant cavity is formed between the total reflection mirror and the output mirror; when the pump light passes through the optical resonant cavity and a gain of the pump light reaches a threshold, a laser beam is output by the output mirror; the laser beam is sequentially converged by the first focusing mirror, partially doubled in frequency by the frequency doubling crystal, and then emitted in parallel via the second focusing mirror, converged and coupled by the coupling lens, and output through the output optical fiber; and the laser beam is a dynamic laser beam with a pulse width of 1 μs-1.5 μs or a static laser beam with a pulse width of 200 μs-300 μs; characterized in that, when the voltage of the electro-optic Q-switching assembly gradually increases or decreases, a loss of the electro-optic Q-switching assembly gradually decreases, and the loss of the electro-optic Q-switching assembly keeps a dynamic balance with a gain of the gain medium all the time, the output mirror outputs the laser beam with a pulse width of 1 μs-1.5 μs; when the voltage of the electro-optic Q-switching assembly is λ/4, the output mirror outputs the laser beam with a pulse width of 200 μs-300 μs, wherein the λ denotes a wavelength of the laser beam output by the output mirror. the controller controls the pump source to generate pump light to irradiate the gain medium; the controller controls the drive circuit; when a voltage difference exists on the electro-optic Q-switching assembly, an optical resonant cavity is formed between the total reflection mirror and the output mirror; when the pump light passes through the optical resonant cavity and a gain of the pump light reaches a threshold, a laser beam is output by the output mirror; the laser beam is sequentially converged by the first focusing mirror, partially doubled in frequency by the frequency doubling crystal, and then emitted in parallel via the second focusing mirror, converged and coupled by the coupling lens, and output through the output optical fiber; and the laser beam is a dynamic laser beam with a pulse width of 1 μs-1.5 μs or a static laser beam with a pulse width of 200 μs-300 μs; characterized in that, when the voltage of the electro-optic Q-switching assembly gradually increases or decreases, a loss of the electro-optic Q-switching assembly gradually decreases, and the loss of the electro-optic Q-switching assembly keeps a dynamic balance with a gain of the gain medium all the time, the output mirror outputs the laser beam with a pulse width of 1 μs-1.5 μs; when the voltage of the electro-optic Q-switching assembly is λ/4, the output mirror outputs the laser beam with a pulse width of 200 μs-300 μs, wherein the λ denotes a wavelength of the laser beam output by the output mirror.