The invention provides an ejector mechanism for demoulding in the production of automobile front bumpers. The mechanism includes a large ejector, a small ejector, a fixed seat, a spring, a first screw, a second screw, a third screw, a cover plate, an ejector plate and a movable mold baseplate. The small ejector is mounted at one end of the large ejector, the large ejector passes through the ejector plate, and the other end is located in the ejector plate and is limited by a limiting step on the ejector plate; the first screw penetrates through the fixed seat and is fixedly connected with the end, located in the ejector plate, of the large ejector; the fixed seat is fixed on the movable mold baseplate by the second screw; the spring is located in the fixed seat, one end of the spring contacts with the nut of the first screw, and the other end of the spring is pressed by the cover plate; and the cover plate is fixedly connected to the movable mold baseplate by the third screw. The ejector mechanism provided by the invention can be pushed out by the spring force during demoulding to complete the demoulding of the product, and is simple for assembling and convenient for repair.