It is an object of the present invention to provide a pressure-accumulating dual-valve electronic fuel injector having a control chamber slide block. The pressure-accumulating dual-valve electronic fuel injector comprises a fuel injector head, a pressurizing control valve, a pressurizing piston, a fuel injection control valve, a nozzle and a fuel injector body. The fuel injector body is provided therein with a pressure accumulating chamber, which can reduce the pressure fluctuation in a fuel injection process, and is advantageous for the precise control of the fuel injection. Dual solenoid valves are used to control a pressurization process and a fuel injection process respectively such that the fuel injection process of the pressure-accumulating dual-valve electronic fuel injector havinga control chamber slide block is not restricted by the pressurization process. Thus, the pressure-accumulating dual-valve electronic fuel injector can work in both non-pressurizing and pressurizing modes. In the non-pressurizing mode, the rail pressure injection is performed. In the pressurizing mode, the ultrahigh-pressure injection is performed. In the pressurizing mode, the pressuring ratio canbe flexibly adjusted by changing the control strategy of the pressuring control valve, thereby achieving high reliability and a wide application range. The control chamber slide block provides the pressure-accumulating dual-valve electronic fuel injector with a decisive fuel cut characteristic, and improves the dynamic property and economical efficiency of a diesel engine.