The invention relates to a novel lightweight environment-friendly pedal of a scaffold for building. The pedal comprises a board, a top skin, a polypropylene honeycomb core material, a bottom skin, anda finished board, wherein the board is of a three-layer sandwich structure; the top skin and the bottom skin are both prepared by compounding multiple layers of continuous glass fiber polypropylene reinforced unidirectional prepreg tape; the pure polypropylene honeycomb core material is arranged at the center; and the skin of the continuous glass fiber polypropylene reinforced unidirectional prepreg tape is prepared polypropylene and continuous glass fibers through compounding, and the skin with a thickness of 0.6 to 2.0 mm and the pure polypropylene honeycomb core are subjected to hot-melting bonding on the finished board. The novel surface layer reinforcing material, i.e., the continuous glass fiber polypropylene reinforced unidirectional prepreg tape, is utilized in the invention, andhas strength and other properties several times better than those of short fiber felt or long fiber composite materials, and the high performance leads to reduction in used materials; i.e., under thecondition of same physical properties, the pedal using the continuous glass fiber polypropylene reinforced unidirectional prepreg tape saves more materials and is reduced in material cost.