The invention discloses an automatic assembling machine which comprises an electrical appliance control cabinet, a delivery mechanism, a grabbing mechanism, a rubber coating mechanism, a detection mechanism and a defective product grabbing mechanism. The delivery mechanism comprises a product input belt, a product output belt and a delivery motor, wherein the product input belt and the product output belt are respectively connected with the delivery motor. The grabbing mechanism is arranged between the product input belt and the product output belt transversely, the rubber coating mechanism is arranged on the middle portion of the grabbing mechanism, the detection mechanism is located below the grabbing mechanism and is connected with the product output belt, the defective product grabbing mechanism is arranged above the detection mechanism, and the electrical appliance control cabinet controls components of the delivery mechanism, the grabbing mechanism, the rubber coating mechanism, the detection mechanism and the defective productive grabbing mechanism to work. According to the automatic assembling machine, the electrical appliance control cabinet controls the components, the automatic assembly line work is achieved, the productivity is improved, the mechanical operation is high in stability, product quality is guaranteed, and market competitiveness is enhanced.