The invention relates to a multi-head aramid constant-tension unwinding system, and relates to an unwinding device used for sending aramid in the production process of beam-shaped optical cables. Themulti-head aramid constant-tension unwinding system comprises a rack, a permanent magnet tensioner, a coupler, a support frame, input shafts, a support bearing, aramid, a locking mechanism, a lower fixed bearing seat, a stabilizing rod, an upper fixed bearing seat and a control system, wherein the rack is of a square pipe welding structure, the support frame is mounted on the rack, through the support frame, the permanent magnet tensioner utilizes the coupler and the support bearing to connect the input shafts into a whole, the aramid is arranged on the input shafts and is fixed and locked through the locking mechanism, the stabilizing rod is connected with the upper fixed bearing seat through the lower fixed bearing seat, shaking in operation can be effectively eliminated through the stabilizing rod in the aramid unwinding process, the permanent magnet tensioner is connected into the control system through a data line, and a display screen and an input setting device are arranged on the control system. Six groups of aramid unwinding systems with the same functions are arranged on the two sides of the rack correspondingly, and the amount can be freely combined according to the different beam-shaped optical cable specifications.