The invention provides an efficient energy-saving sand drying method for construction, and relates to the technical field of construction engineering. The sand drying machine comprises two drying boxes, wherein the two drying boxes comprise the first drying box and the second drying box. The upper ends of the first drying box and the second drying box communicate with each other through an air delivery pipe, and a first control valve is arranged on the air delivery pipe. A cooling box is arranged at the position between the lower ends of the first drying box and the second drying box, and thecooling box is connected with the first drying box and the second drying box through air delivery pipes. A second control valve and a third control valve are arranged on the connected air delivery pipes correspondingly. By arranging the two drying boxes, the problems that in the current market, heat energy in drying boxes of most sand drying machines can run off into the air at a large amount, thus the utilization rate of resources is low, the resources are wasted, when the sand demanded quantity is too large, one drying box cannot complete drying of sand, and thus the construction schedule isdelayed are solved.