The utility model relates to a novel single-pole isolating switch in a power supply circuit, which comprises a base, supporting insulators, a fixed contact, a movable contact and terminals, wherein one end of each supporting insulator is fixedly connected with the base, the other end of each supporting insulator is respectively provided with the terminals, the tail end of one supporting insulator is provided with the fixed contact, the tail end of the other supporting insulator is movably connected with the movable contact, the other end of the movable contact is movably connected with the fixed contact head, one side of the base is provided with a connecting rod, and the tail end of the connecting rod is provided with an installing hole. The utility model has the advantages that: firstly, large-load current can pass through the novel single-pole isolating switch; secondly, the outdoor direct-hanging type single-pole isolating switch can be conveniently installed, can be arranged on a cross arm, is fixed and firm and can save time and materials at the same time; and thirdly, owing to a slant angle, an operator can more safely and conveniently use an insulating bar to operate.