The invention discloses a motor vehicle driver examination system mainframe which includes a mainframe. A movable body is arranged on one side of the mainframe and provided with an adjusting device, second connecting blocks are symmetrically rotatably connected to the movable body away from the mainframe, one side of the movable body far away from the mainframe is rotatably connected with a firstconnecting block, one side of the first connecting block far away from the second connecting blocks is rotatably connected with a connector, a rotating part is arranged between the connector and the first connecting block, the first connecting block is rotatably connected with the connector through the rotating part, a motor vehicle body is arranged below the mainframe, and the connector is inserted in the motor vehicle body. The motor vehicle driver examination system mainframe is simple to operate; through the mutual matching of the adjusting device, a clamping device, the mainframe, a control module and a database, all actions of a motor vehicle can be detected and graded, real-time data update is ensured, and the mainframe can move freely, to provide convenience for users in the driving process.