The invention discloses an electrical control management unit for engine fuel gas. The electrical control management unit comprises a main control unit as well as an ignition drive and ignition feedback circuit, an oil injection drive and fault diagnosis circuit, a low side drive and fault diagnosis circuit, a step motor drive and fault diagnosis circuit, an oxygen sensor heating and fault diagnosis circuit, an analog input signal processing unit, a switch value input signal processing unit, a data storage unit, a knock signal processing unit, a frequency signal processing circuit, a power supply and reset management unit and a communication unit which are connected with the main control unit respectively. According to the electrical control management unit, crankshaft signal processing circuits in the power supply and reset management unit, the communication unit and the frequency signal input unit are changed to integrated combination from discrete chips; not only are three discrete circuit units reduced, but also the consumption of integrated chips is remarkably reduced, so that the purpose of reducing the cost is achieved; meanwhile, an oxygen sensor heating drive circuit controlled by the integrated chips is changed to be built by discrete devices to improve the heating drive capability.