The invention discloses an inner cavity discharging device of a constant velocity universal joint besides-star wheel vehicle. The charging device comprises a first vehicle inner cavity lathe, a second vehicle inner cavity lathe and a vehicle inner cavity translation track; a lifting cylinder, a translation drive servo motor and a cycle driving chain belt are arranged on the vehicle inner cavity translation track; a piston rod of the lifting cylinder is arranged downwards and an electromagnet is arranged at the bottom of the piston rod, an inflation positioning bag is arranged on the side surface of the electromagnet, the side surface of the electromagnet is fully surrounded by the inflation positioning bag, a power supply control wire is connected to the electromagnet, an air way control wire is connected to the inflation positioning bag, one end of the power supply control wire is connected with the electromagnet, a power supply of a control switch is arranged at the other end of the power supply control wire in a connection manner, one end of the air way control wire is connected with the inflation positioning bag, and a compressed air supply of a three-way valve is arranged at the other end of the air way control wire in a connection manner; the device further comprises a charging conveyor belt, and a conveying stop end of the conveyor belt is located below the vehicle inner cavity translation track.