The invention discloses a belt conveyor of a vacuum low-temperature grain drying tower. The belt conveyor comprises a base and a support frame, wherein a groove No.1 is formed in the surface of the base, a controller is arranged at one side of the groove No.1, the surface of the base is connected with an electric compressive rod, the bottom of the electric compressive rod is provided with a rotating shaft, the top of the electric compressive rod is provided with a sliding rod, the bottom side of the support frame is provided with a groove No.2, a sliding rail is arranged in the groove No.2, rolling wheels are arranged at the two sides of the support frame, one sides of the rolling wheels are connected with a chain, one side of the chain is connected with an electromotor, one side of the electromotor is provided with a cooling fan, and a conveyor belt is arranged on the surfaces of the rolling wheels. The belt conveyor is novel in design, meets actual work requirements, is convenient to use as the conveyor belt can be regulated in upper, lower, left and right directions, is convenient to store, occupies small area, is high in practicability, is suitable for various complicated environments, can be continuously used, is long in service life, is high in work efficiency and is suitable for wide popularization.