A vehicle end electric connecting device for a rail train, comprising: a mechanical connecting portion, moving in a first direction so as to be connected to a mechanical connecting portion of another vehicle end electric connecting device; a plurality of electric connecting portions, spaced apart from each other around the mechanical connecting portion, each electric connecting portion of the plurality of electric connecting portions comprising a plurality of connecting ports facing the first direction, the connecting ports being configured for connecting to connecting ports of the another vehicle end electric connecting device, and the connecting ports being interfaces or joints, or the connecting ports being interfaces and joints; and a housing, wherein the housing is provided with a ground connecting portion for connecting a ground wire, the vehicle end electric connecting device further comprises an electric conduction portion arranged on the housing, and the electric conduction portion is configured to electrically connect the housing to a housing of the another vehicle end electric connecting device, wherein, no more than one electric connecting portion is provided on each side of the mechanical connecting portion; the plurality of electric connecting portions comprise a high-voltage connecting portion, arranged on a left side of the mechanical connecting portion or a right side of the mechanical connecting portion; the high-voltage connecting portion comprises the 700V connecting port and the 1,500V connecting port, and the high-voltage connecting portion further comprises a separation board for separating the 700V connecting port and the 1,500V connecting port. a mechanical connecting portion, moving in a first direction so as to be connected to a mechanical connecting portion of another vehicle end electric connecting device; a plurality of electric connecting portions, spaced apart from each other around the mechanical connecting portion, each electric connecting portion of the plurality of electric connecting portions comprising a plurality of connecting ports facing the first direction, the connecting ports being configured for connecting to connecting ports of the another vehicle end electric connecting device, and the connecting ports being interfaces or joints, or the connecting ports being interfaces and joints; and a housing, wherein the housing is provided with a ground connecting portion for connecting a ground wire, the vehicle end electric connecting device further comprises an electric conduction portion arranged on the housing, and the electric conduction portion is configured to electrically connect the housing to a housing of the another vehicle end electric connecting device, wherein, no more than one electric connecting portion is provided on each side of the mechanical connecting portion; the plurality of electric connecting portions comprise a high-voltage connecting portion, arranged on a left side of the mechanical connecting portion or a right side of the mechanical connecting portion; the high-voltage connecting portion comprises the 700V connecting port and the 1,500V connecting port, and the high-voltage connecting portion further comprises a separation board for separating the 700V connecting port and the 1,500V connecting port.