The invention relates to equipment for utilizing solar power, and in particular relates to a device for utilizing the solar power to heat air. A solar air collector comprises air flue header boxes, a photic zone, a heat absorber plate and a heat insulating board, wherein a main air tube is arranged in each air flue header box; two air flue header boxes are respectively connected with the photic zone, the heat absorber plate, and the front end and the rear end of the heat insulating board; the heat absorber plate is positioned on the upper part of a heat insulating layer, the heat absorber plate is hollow arc-shaped, and the upper part of the heat absorber plate is coated with a layer light-absorbing material; and the heat absorber plate is communicated with the main air tubes, and the photic zone is positioned on the upper surface of the heat absorber plate. The solar air collector provided by the invention has the advantages of large heat absorption area of the heat absorber plate, high heat absorption efficiency, small hot air resistance, convenience in manufacturing and installation, low cost and long service, and can be combined to form a large enough area so as to meet different heat collecting requirements.