A double-wheel upturned pulley comprises a pulley frame formed by two rectangular steel sheets connected via screws and key slots, shaft stools are fixed on two ends of the pulley frame, one fixing shaft is mounted on each shaft stool, a bearing is mounted on each fixing shaft, and a pulley wheel is mounted on each bearing, two sides of the shaft are fixed with the shaft stools via screws, and big-end-up trapezoidal wire-falling prevention frames are respectively mounted on two sides of the shaft stools and above the shaft stools. The double-wheel upturned pulley can be stretched to any required length, and large rigid stress during tension stringing can be borne. When a wire or a steel wire penetrates the pulley wheels, the tension stringing position is quite close to an actual position owing to design of the upturned pulley , and error is small; workers can be guaranteed to avoid injury caused by the wire falling off, and work can be quickly and efficiently completed. Defects about low wire hanging position, large abrasion and limited stressed direction are avoided. The double-wheel upturned pulley is light and handy in modeling, simple in structure, convenient to carry and can be widely utilized to soft bus stringing working in substations.