The utility model discloses a lapped iron-notch combined brick, comprising at least two iron-notch bricks, wherein communicated molten iron outlets are formed in the iron-notch bricks; and lapping lugs for preventing blast-furnace gas from penetrating through and leaking are arranged at the brick joint ends (which are in contact) of the iron-notch bricks. According to the lapped iron-notch combined brick, the iron-notch bricks are combined together by in a lapped manner so that the blast-furnace gas is prevented from going up along the through brick joint; as a result, the operation safety is improved; and simultaneously, the iron-notch bricks can be prevented from being damaged untimely, and the service life of the iron notch and the service life of the blast furnace are prolonged.