The invention relates to a method for fixing a Velcro connecting piece to an automotive pedal pad, which is characterized in that: a Velcro connecting component is adhered to the pedal pad to form a whole through a plastic film ring, ultrasonic welding heating is adopted, the obtained heat makes the three welded objects quickly molten, adhered and fixed to the back of the pedal pad, and a clear joint surface of the three, having a grid welding rib concave-convex three-dimensional appearance and high peel strength characteristic, is formed. The film ring is made of polyethylene or other materials, and can cover the surface of the Velcro connecting component or be arranged between the Velcro connecting component and the pedal pad; the thickness of the film ring is between 0.1 and 2mm; and the shape of the film ring is the same as that of the Velcro connecting component, and is a specific figure such as a circle and the like. The welding process adopts the following conditions: the vibration frequency is 30,000-50,000 / second; the welding time is 2-10s; the vibration pressure is 100-300Kpa; and the vibration amplitude of bottom stitches is 0.1-2mm. The method has the advantages of short time, easy control, wide material selection range and no harmful gas.