The invention discloses a DC electrical docking device capable of automatically pulling-in and disconnecting, comprising a floating module and a fixed module, wherein, the floating module consists ofa wiring post A, a wiring post B, a plug A, a plug B, a traction conductor A, a traction conductor B, a return spring A, a return spring B, a floating butt joint, a floating contact point A, a floating contact point B, a permanent magnet A and a permanent magnet B; and the fixed module consists of a permanent magnet C, a permanent magnet D, a fixed contact point A, a fixed contact point B and a fixed butt joint. The return spring A and the traction conductor A are communicated with the floating contact point A and the wiring post A; and the return spring B and the traction conductor B are communicated with the floating contact point B and the wiring post B. When the floating module is close to the fixed module, the permanent magnet A is connected with the permanent magnet C in an actuatingmanner, and the floating contact point B is connected with the permanent magnet D in an actuating manner; and when the floating module is separated from the fixed module, the two traction conductorspull away the two floating contact points to disconnect circuits with each other. The device can keep conduction in the case of vacillation and dislocation of the two plug bodies, and is particularlyapplicable to the fields of remote circuit conduction, field remote control operation and the like.