The invention relates to a method for installing and arranging electrical components of an electromobile and an electrical box. By using an installing and arranging manner of integrated electrical equipment, an electric machine controller of a vehicle, a low-voltage charger of 24V, an auxiliary inverter, a high voltage inputting part, a high voltage outputting part, a diode assembly, a low voltage part/ control part and the like are integrally installed in an electrical box body which is installed on a tailstock, and all the electrical components and parts are installed in the box body and on a lower cover plate, wherein the electric machine controller, the low-voltage charger of 24V, the auxiliary inverter and the high voltage inputting part are installed on an installation platform in the box body; the high voltage outputting part is installed on a small insulation board; the low voltage part/ control part is installed on the lower cover plate; a chassis is arranged below the box body, and the box body is connected with the chassis through an insulation pad; the lower cover plate is arranged on the box body; and the lower cover plate is provided with an upper cover plate thereon.