Connecting structure of built-in axle box bogie driving device and assembling method of connecting structure

The invention provides a connecting structure of a built-in axle box bogie driving device and an assembling method of the connecting structure. The connecting structure comprises a first hanging seat and a second hanging seat which are oppositely connected to the two sides of a bogie, and a traction motor and a gearbox which are arranged on the inner side of the bogie. One end of the traction motor is provided with an adjustable connecting piece which is vertically connected with the first lifting seat; the power input end of the gear box is in transmission connection with the power output end of the traction motor through a coupler, one end of the gear box is provided with a lifting rod vertically connected with the second lifting seat, and the ends, close to each other, of the gear box and the traction motor are transversely connected through a rubber node; and a transverse pre-adjusting amount and a vertical pre-adjusting amount are formed between the adjustable connecting piece and the first lifting seat.