The invention provides a radial multi-coil high-speed electromagnet. The radial multi-coil high-speed electromagnet comprises an outer shell, an iron core and a coil, wherein the iron core comprises a main magnetic pole and an auxiliary magnetic pole, the main magnetic pole is a cylinder, the auxiliary magnetic pole is a cylinder provided with a through hole at the center, the main magnetic pole is arranged in the through hole of the auxiliary magnetic pole, the outer shell sleeves the main magnetic pole, a convex ring is arranged on the main magnetic pole or the auxiliary magnetic pole, fan-shaped or wrist-shaped through holes are uniformly formed in the convex ring in an axial direction, a coil inner core is formed between two adjacent fan-shaped through holes, and the coil is radially wound around the coil inner core. The radial multi-coil high-speed electromagnet has the characteristics of fast response speed, small driving current, high reliability and favorable cooling performance, and is suitably used for an electronically-controlled fuel system of a diesel engine.