The invention discloses an environment-friendly type synthesis polymer steel roofing paint, which belongs to the field of waterproof construction. The paint comprises the following components: 8-20 parts of a polyolefin thermoplastic elastomer, 4-8 parts of aldehyde ketone resin, 2-12 parts of styrene resin, 1-5 parts of silicon powder, 1-10 parts of mica powder, 1-5 parts of rutile titanium dioxide, 0.3-1 part of an antioxidant 1010, 0.3-1 part of an antioxidant 1076, 0.3-1 part of an anti-oxidant 531, 0.5-2.5 parts of an antifoaming agent, 0.3-1 part of an ultraviolet ray absorber, 5-30 parts of D40 solvent naphtha, and 5-30 parts of butyiate solvent naphtha. The milk-white steel roofing waterproof paint has the characteristics of no toxicity, no harm, no pollution, no containing of noxious materials and harmful components such as pitch and benzene, and realization of free toning. The product performance is stable, the material service life can reach 30 years or more, and has the characteristics of strong adhesion stress, good penetration performance and good elongation percentage.