The utility model provides a bus type outdoor current mutual inductor special for a transformer. The bus type outdoor current mutual inductor special for the transformer comprises a cylindrical middle mutual inductor section, wherein cylindrical edge mutual inductor sections are arranged on the two sides of the middle mutual inductor section respectively, the middle mutual inductor section and the edge mutual inductor sections are coaxial, and a bus through hole is formed in the middle mutual inductor section and the edge mutual inductor sections; the middle mutual inductor section is provided with a cavity which surrounds the bus through hole, an iron core which surrounds the bus through hole is arranged in the cavity, a secondary winding is wound around the iron core, and the secondary winding is wrapped in an insulating layer; a support is fixed below the middle mutual inductor section, a cylindrical lower mutual inductor section is arranged outside the support and is connected with the middle mutual inductor section; the lower mutual inductor section is provided with a terminal groove, a secondary terminal is arranged in the terminal groove, and the secondary terminal is connected with the secondary winding; the terminal groove is provided with a wiring hole; a base is fixed below the support; umbrella skirts are arranged on the outer surfaces of the edge mutual inductor sections and the outer surface of the lower mutual inductor section; an epoxy resin mutual inductor body is formed by integrally pouring the middle mutual inductor section, the edge mutual sections and the lower mutual inductor section. The bus type outdoor current mutual inductor special for the transformer is small in size, simple in structure and high in safety performance.