Disclosed is an improved hub extrusion casting mold. Springs (1) are arranged in guide posts (5), a large ejector rod (9) and a small ejector rod (21) are fixed onto a discharge plate (23) by an ejector rod fixing plate (4), an upper mold core (10) is fixed into an upper mold fixing plate (7-1) via connecting screws (8), locking modules are fixed onto the upper mold fixing plate, slanting guide posts (7) are fixed in the cavity formed by an upper connecting plate (6) and the upper mold fixing plate, hydraulic cylinder assemblies (14) are fixed by fixing plates (13) to assist in combination and separation of side molds (12), a side mold guide rail (15) is connected with a pressure plate (16), the pressure plate is connected with a lower mold (20) and a bottom plate (17), and a stamping guide sleeve is connected with the bottom plate.