The utility model relates to a mobile catenary moves changeover portion device admittedly. For guaranteeing the smooth transition of locomotive pantograph between stationary contact net and mobile catenary, the juncture need set up hard and soft transition mechanism and realize reliable the connection. The utility model discloses being located mobile catenary and netting the district's section that links up with the stationary contact, mobile catenary installs in door shaped frame one side, and the opposite side at door shaped frame is installed to the stationary contact net, compared with the prior art, hinged cantilever revolutes a horizontal rotation through steel wire ropes and assembly pulley down in the effect of putting of the book of motor, realizes mobile catenary and stationary contact and nets electrical connection and disconnection. The utility model discloses a gradual change of weight, rigidity is hung in the contact, and when guaranteeing that the pantograph slips the gradual change roof beam, the contact force that it received is a process that gradually changes, can play attenuation to contact wire's amplitude.