An ammeter series access apparatus

The invention discloses an ammeter series access apparatus comprising a plug portion and a socket portion. The plug portion comprises a plug seat, a plug housing, a double-surface copper-clad plate, a current reference direction identification column, a red conductive wire and a black conductive wire. The double-surface copper-clad plate goes through the plug seat. The current reference direction identification column is arranged on the bottom portion of the plug seat. The lower end of the red conductive wire is welded with the right side surface of the double-surface copper-clad plate. The lower end of the black conductive wire is welded with the left side surface of the double-surface copper-clad plate. The socket portion comprises a socket housing, a first metal leaf spring set and a second metal leaf spring set. Left leaf springs of the two metal leaf spring sets are fixed on the socket housing through a left metal screw bolt and a left upper metal screw. Right leaf springs of the two metal leaf spring sets are fixed on the socket housing through a right metal screw bolt and a right upper metal screw. The socket housing is provided with a double-surface copper-clad plate insertion hole and a current reference direction identification column insertion hole. The invention eliminates a phenomenon that the circuit is suddenly connected or suddenly disconnected when one contact point is in use, and a reference direction of a detected current can be clearly determined.