The utility model relates to the technical field of operation and maintenance devices, in particular to a transformer substation operation and maintenance integrated tool car which comprises a flat car, a working carriage and a lifting platform. A working carriage is arranged on a platform of the flat car, a partition plate is arranged in the working carriage which is arranged on the working carriage, the partition plate divides the working carriage into a first storage chamber and a second storage chamber, a tool cabinet is arranged in the first storage chamber, and a rotary hanging frame capable of horizontally rotating is further arranged in the first storage chamber. The device is reasonable and compact in structure; during operation and maintenance, the platform lorry is moved to a target position; related tools are taken out from the tool cabinet in the work carriage, small parts can be conveniently put in order and found through the tool cabinet, related electric clothing facilities can be conveniently hung through the rotary hanging frame, taking and using are convenient, the containing capacity is large, efficiency is high, the tools are convenient and fast to transport, operation and maintenance efficiency is greatly improved, and labor intensity of workers is effectively reduced.