The utility model relates to a novel solar air heater, which is provided with a rectangular frame enclosed by an aluminum alloy frame; short edges on two sides of the rectangular frame are sealed; long edges on two sides of the rectangular frame are provided with air inlet and outlet ports; the bottom of the whole rectangular frame is filled with an embossing aluminum plate; then, a glass cotton insulation layer, a high-density glass cotton plate insulation layer and a selective heat collecting plate core are paved on the rectangular frame from bottom to top in sequence; the upper part of the rectangular frame is reserved with a space for heated air to flow; the top part of the rectangular frame is covered with float tempered glass or low-iron photovoltaic tempered glass; and the periphery of the rectangular frame is sealed by EPDM rubber. The novel solar air heater has the advantages of simple structure and low cost, energy conservation, emission reduction, and environmental protection, and can be widely applied to a curing houses, greenhouses and dwelling houses.