The invention discloses a method for synthesizing dihydrofuran derivatives under the catalytic action of copper. The method comprises the following steps: in the presence of a copper catalyst and an oxidizer, dissolving olefins (including common terminal olefin and internal olefin) and 1,3-dicarbonyl compounds in an organic solvent, uniformly mixing, reacting at 80-100 DEG C in a nitrogen atmosphere for 20-28 hours, and separating and purifying to obtain the dihydrofuran derivatives. The preparation method is simple, and uses the simple and accessible raw materials (olefins and 1,3-dicarbonyl compounds) to directly construct the dihydrofuran derivatives. The method is mild in preparation conditions, and can obtain the target products at 80-100 DEG C at high selectivity. By using the cheap and accessible cupric chloride as the catalyst, the method is green and economical. The method has favorable substrate applicability, greatly widens the substrate range, and has great application potential in the aspect of biomedicine synthetic intermediates.