Test power supply and installation assembly thereof

The invention discloses a test power supply and an installation assembly thereof, and aims to solve the problems of complex assembly process, difficult maintenance and too many leads of a multi-layer PCB assembly, and the test power supply specifically comprises an installation assembly, a first circuit board, a second circuit board, a third circuit board, a fourth circuit board, a fifth circuit board, a fan assembly and a bus switching circuit board; the mounting assembly comprises a mounting bottom plate and N + 1 insulating plates vertically mounted on the upper surface of the mounting bottom plate side by side, N is larger than or equal to 1, and N air channels are formed; a fan assembly is arranged in the middle section of each air duct, and a first circuit board and a second circuit board are arranged on the rear side of each fan assembly. The first circuit board and the second circuit board are installed back to back and are electrically connected through the conductive columns. A third circuit board,