A self-adapting double-interval PWM quick charging system comprises a first analyzer, a second analyzer, a detection device, a controller and a main circuit, wherein the detection device is connected with the first analyzer and the second analyzer at the same time; the first analyzer and the second analyzer are connected with the controller at the same time; the controller is connected with the main circuit; electric energy of a power distribution network is transmitted to a battery to be charged after being converted and adjusted by the main circuit; two ends of the battery is connected with the detection device. The system has the advantages that the polarization effect is effectively reduced, and meanwhile, according to the self state of the battery, under the premise that the condition that the battery is not damaged is ensured, the initial current value and the electric current attenuation index in the different time periods of quick charging can be dynamically adjusted, so that the initial current value and the electric current attenuation index can reach optimum; the detection device is simple, and only the battery voltage is needed to be measured; according to the overall system, the hardware complexity is reduced through the software complexity, meanwhile certain degree of self adaptivity and intelligence can be achieved, and no manual intervention is needed in the whole charging process only if the analyzers are needed to be trained in advance.