The invention relates to low-gloss bending-resistant heat transfer printing powder coating used for section aluminum and a preparing method thereof. The powder coating is prepared by mixing an A component and a B component. Raw materials of the A component include saturated carboxyl-ended polyester resin A, a TGIC curing agent, enclosed type isocyanate, extinction barium sulfate, a leveling agent, a brightening agent, benzoin, wax powder, a wax-based flatting agent, rutile type titanium dioxide, carbon black and iron oxide yellow. Raw materials of the B component include saturated carboxyl-ended polyester resin B, a TGIC curing agent, enclosed type isocyanate, extinction barium sulfate, a leveling agent, a brightening agent, benzoin, wax powder, rutile type titanium dioxide, carbon black and iron oxide yellow. Coating films of the powder coating have significant characteristics of extremely good storage stability, bending resistance and impact resistance, excellent whether resistance, high decoration performance, and the like.