Abstract: A sorting device of electronic card connector socket, which is mounted in the wider socket or the slot of the socket. A gate board is resiliently pivotally mounted in the wider socket for blocking the passage of the socket. Each sorting member is resiliently pivotally mounted in the proximity of the gate board and extends into the socket for locking and preventing the gate board from being pushed away. A gap defined between the two sorting members is larger than the thickness of an incorrect card to be hindered. The thinner incorrect card is unable to at the same time push away both the sorting members and will be hindered by the gate board from being inserted into the wider socket. Reversely, the thicker correct card is able to simultaneously push away both sorting members to unlock the gate board and be successfully inserted into the socket.