Production line, production line bus car and production line subcar

The invention relates to a production line, a production line bus car and a production line subcar. The production line includes at least one main track and more than one branch track. The main trackand the branch track are arranged in a cross mode. At least one bus car is movably arranged in the guiding direction of the main track, and at least one subcar is movably arranged in the guiding direction of the branch track. The bus car is provided with a platform for carrying the subcar. When the bus car drives to the intersection of the main track and the branch track, the subcar is out of theplatform and enters the branch track, or the subcar runs from the branch track to the platform. The subcar is provided with a rechargeable battery to provide power for driving the subcar. The bus caris provided with a first charging connection port for charging the rechargeable battery. The subcar is provided with a second charging connection port for supplying power and connecting with the rechargeable battery. When the s