The invention discloses a mold ejection device for products with multiple ribs inside. The mold ejection device comprises straight ejecting mechanisms, oblique ejecting mechanisms, a top plate assembly and at least one set of secondary ejection mechanism; multiple sets of straight ejecting mechanisms are arranged, the lower ends of the straight ejecting mechanisms are connected to the top plate assembly, and the upper end edges of the straight ejecting mechanisms abut against the bottom end of a product (1); the number of the oblique ejecting mechanisms is determined according to the number of through holes (2) in inner rib plates (3) inside the product (1), the lower ends of the oblique ejecting mechanisms are connected to the top plate assembly, and the upper ends of the oblique ejecting mechanisms abut against the inner bottom surface of the product (1); and the secondary ejection mechanisms are rotatably connected to the top plate assembly, and one end of the secondary ejection mechanism is movably connected with the bottom of one set of straight ejection mechanism. After adoption of the structure, during complete demoulding, the stroke of straight ejecting rods is larger than the stroke of oblique ejecting rods, and therefore, an operator can very conveniently take down the product from the straight ejecting rods without damaging the product.