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 . <EOS>