The invention discloses a construction method of a frame type grain drying tower. The method comprises following steps: firstly, an embedded foundation is manufactured on the ground, and a drying tower base is mounted on the embedded foundation; secondly, a frame is mounted on the drying tower base, and construction of a drying tower main frame is completed; thirdly, a hot air inlet and outlet angular box is mounted on the frame, an opening closing plate is arranged at the end face of the angular box on the corresponding mounting layer, mounting of the angular box is carried out, and drying segments and tempering segments of the drying tower are formed; fourthly, a sealing plate is used for sealing hollow space between body frame beams and columns; fifthly, a hot blast heater, a cleaning screen, a lifting machine, a conveying machine, an air flue and the like are mounted in place and are connected with a drying machine tower body; sixthly, the drying tower is subject to heat preservation waterproof treatment. Parts of the drying tower are subject to miniaturization and lightweight treatment, manufacturing, transporting and mounting are facilitated, the layered construction mode from low to high is broken through, the parallel mounting work is achieved, work cost is reduced, and work efficiency is improved.