Lamp box cloth tensioning device

The utility model discloses a lamp box cloth tensioning device which comprises an outer frame, an illuminating mechanism, a feeding mechanism and a flattening mechanism are arranged in the outer frame, a protection mechanism is arranged on the outer frame, the feeding mechanism comprises an upper roll shaft, the two sides of the upper roll shaft are arranged on an inner shell, one end of the upper roll shaft is connected with a first motor, and the other end of the upper roll shaft is connected with a second motor. A lower roller shaft is arranged in front of the bottom of the inner shell, the two sides of the lower roller shaft are arranged on the inner shell respectively, one end of the lower roller shaft is connected with a second motor, and the first motor and the second motor are fixed to the outer side of the inner shell. The lamp-box fabric tensioning device is simple in structure, achieves the tensioning effect on the lamp-box fabric, does not cause great damage to the lamp-box fabric, and prolongs th