The invention relates to the field of coatings, concretely relates to a powdery coating for engineering machinery, and provides a novel powdery coating for engineering machinery and with a low curingtemperature and a fast curing speed, and a preparation method thereof. The powdery coating includes, by weight, 30-80 parts of bio-based polyester resin, 10-30 parts of a curing agent, 10-20 parts ofrutile type titanium dioxide, 0.5-1 part of a silane-modified leveling agent, 0.6-1 part of anti-yellowing benzoin, 0.6-1 part of an antioxidant, 10-30 parts of a composite filler and 2-5 parts of a pigment. The powdery coating can accelerate the spraying efficiency while saving energy.