The utility model discloses a vehicle-mounted automatic framing device, and the device comprises a platform lorry. The front end of the platform lorry is provided with a feeding transit segment, and a part, close to the feeding transit segment, of the front upper part of the platform lorry is provided with a material-receiving buffering segment. A part, close to the material-receiving buffering segment, of the upper part of the platform lorry is provided with a to-be-pushed zone. The to-be-pushed zone is provided with a horizontally-pushing and -extruding mechanism and a feeding mechanism. The rear part of the platform lorry is provided with a basket-lifting mechanism, and the upper part of the basket-lifting mechanism is provided with a pressing package mechanism. A feeding blocking mechanism is disposed between the feeding transit segment and the material-receiving buffering segment. A side, close to the to-be-pushed zone, of the basket-lifting mechanism is provided with a material-returning blocking mechanism. The lower part of the basket-lifting mechanism is provided with a lifting supporting leg. The device can achieve the automatic framing of an original cigarette packet, is convenient to move, saves manpower, and is high in efficiency.