The invention discloses a combined photovoltaic transformer substation, comprising a container, wherein the container comprises a base, a top cover and a plurality of upright posts; A partition plateis arranged between the base and the top cover to partition the accommodation space between the base and the top cover into a high-pressure chamber and a low-pressure chamber; The high-voltage cabinet, transformer, instrument box and terminal box are set in the high-voltage room. A low-voltage cabinet is arrange in that low-voltage chamber; A measurement and control device and a UPS power supply are arranged in that terminal box; A low-voltage outlet row of that transform and an outlet hole of the low-voltage chamber are arrange on the diaphragm; The side wall of the high-voltage cabinet facing the transformer is provided with a first wire hole; A first elevating seat is arranged between the transformer and the base, a second elevating seat is arranged between the terminal box and the base, and an outlet hole is arranged at one end of the partition plate close to the base; The side wall of the low-voltage cabinet facing the partition plate is provided with a second wire hole. The technical proposal of the invention aims at solving the problem of unreasonable spatial arrangement in a container-type photovoltaic transformer substation.