The utility model discloses a motor type electrical automatic plugging system of a crane upper frame, which comprises an upper frame, a container lifting appliance, a floating plug mechanism and a floating socket mechanism, the upper frame is arranged above the container lifting appliance, the floating plug mechanism is arranged on the upper frame, and the floating socket mechanism is arranged onthe container lifting appliance; the floating plug mechanism comprises a guide rail structure, a plug structure support, a first spring device, a plug structure, a lead screw structure, a driving motor, a supporting rod, a coarse guide shaft and a fine guide shaft. The floating socket mechanism comprises a positioning plate, a second spring device, a supporting base and a socket structure, and thesocket structure is provided with a horn guide hole, an accurate guide hole, a rainproof cover, a torsional spring, an overturning shaft and an overturning collision block. According to the utility model, the automatic connection and disconnection of energy and signal transmission lines are realized in the connecting and disconnecting operation process of the upper frame and the container liftingappliance, and meanwhile, the floating plug mechanism has the characteristics of high stability and lasting work.