Vehicle-mounted inverter with multi-adaptive fixed structure

The utility model belongs to the technical field of vehicle-mounted inverters, and particularly relates to a vehicle-mounted inverter with a multi-adaptive fixed structure, which comprises a main body mechanism, a first expansion mechanism and a second expansion mechanism. The first extension mechanism is movably clamped on the outer wall of one side of the main body mechanism, and the second extension mechanism is movably clamped on the outer wall of the other side of the main body mechanism; the output end of a micro motor drives a lead screw to rotate, so that a rack in threaded connection to the lead screw slides, the rack drives a driven gear in meshed connection to rotate, and the linkage plate is driven to rotate. Guide wheels at the two ends of the linkage plate abut against and are connected with a first expansion mechanism and a second expansion mechanism; the first extension mechanism and the second extension mechanism are separated from each other to enlarge the size of the vehicle-mounted inverte