The invention discloses vehicle-mounted building 3D printing equipment. The vehicle-mounted building 3D printing equipment comprises a transportation stirring system and a pair of vertical telescopic stand columns. A telescopic beam is arranged between the vertical telescopic stand columns. A telescopic extrusion printing head capable of sliding along the telescopic beam is assembled on the telescopic beam and can rotate relative to the vertical telescopic stand columns. A first sliding rail is arranged in the transportation stirring system, the bottom of one of the pair of vertical telescopic stand columns is assembled to the first sliding rail, the bottom of the other vertical telescopic stand column is assembled on a transverse folding track, and a base plate power device is arranged at the bottom of the transverse folding track. According to the vehicle-mounted building 3D printing equipment, a vehicle-mounted structure and modular design are adopted, the transportation efficiency and space of the printing system are increased, and accordingly the construction cost is saved.