Expansion anchor bolt

The utility model discloses an expansion anchor bolt which comprises an expansion device (1), an extrusion device (2) arranged in the expansion device (1) and a pushing device (3) for driving the extrusion device (2) to move forwards, and the pushing device (3) and the extrusion device (2) are respectively and detachably connected with the expansion device (1). According to the expansion anchor bolt, the striking core and the expansion device are matched to work, after the expansion device is inserted into a pre-drilled hole, the threaded head is connected with an external machine to drive the striking core to extrude forwards, after the striking core slightly opens the clamping and blocking piece, the threaded head stops operating, then the connecting device is connected with the external machine, and the expansion device and the striking core continue to rotate; the emery on the clamping and blocking piece cuts the hole, the internal hole is enlarged, the operation is repeated until the striking core can co