Abstract: Considering the problem that the long distance and large-capacity belt conveyor, the force of the belt conveyor is too large, and the tensioning stroke is too large, which in turn causes the long frame of the vehicle-type tensioning device and the height of the tensioning tower. To meet the needs of construction requirements, by designing a multi-layer belt-wound tensioning trolley and double-rate moving pulley tower mechanism system to shorten the tensioning stroke, the length of the tensioning frame is reduced by half and the height of the tensioning tower is reduced by half. To meet the construction needs of narrow sites, strong adaptability, high degree of automation, no additional maintenance, considerable economic benefits, provides an important reference for the design of long distance belt conveyor tensioning system.