The invention discloses an extremely light image super-resolution reconstruction method, which effectively alleviates the problem of shallow information loss by constructing a dense feature fusion neural network skeleton. According to the invention, based on a distillation network mechanism, a multi-scale receptive field feature fusion architecture is designed, and richer and more diversified features can be extracted; for the feature extraction subunits, a feature extraction module which is more efficient and lighter is adopted, so that the efficiency of the whole network is greatly improved; according to the method, a very simple non-local module based on Hash mapping is designed, and the correlation between points is deeply mined at very low cost; in addition, spatial information, channel information and second-order information are ingeniously fused, and an attention module with better performance is obtained. The method provided by the invention is small in parameter quantity, small in calculation amount and high in precision, and exceeds all image super-resolution reconstruction methods below 800K at present.