A structure of automatic return band tape for reducing the ruler shell, lightening the weight and lengthening the ruler tape is disclosed, and the structure of the band tape includes: a ruler shell (1), a winding drum (2) mounted in the ruler shell, a ruler strip (3) winded around the winding drum, a windin device (4) mounted in the winding drum (2), a rotation shaft (5) penetrating the windin device, a base plate (6) mounted on the side of the windin device, a
pinion mounted on the center of the base plate; the turbination spring (44) mounted in the said winding wheel (42), the inner ring teeth (422) are mounted on the side of winding wheel, the gear cluster (61) are mounted on the base plate, and joggling with said inner ring teeth (422), the additional
pinion (7) is also joggled with the gear cluster (61) and driven by the rotation shaft (5) or winding drum (2) to drive the gear cluster (61) to drive the winding wheel (42) to crinkle the turbination spring (44). For reasons given above, the structure of automatic return band tape can be pulled out longer than traditional band tape, reduce the ruler shell, lighten the weight and unreel quickly.