Online speed measuring device for float glass production line and float glass production line

The utility model provides an online speed measuring device for a float glass production line and the float glass production line, and relates to the technical field of speed measuring devices. The on-line speed measuring device comprises a first shaft wheel, a second shaft wheel and an encoder. Wherein the first shaft wheel is arranged on the glass tape and is tangent to the glass tape; the second shaft wheel is arranged on the first shaft wheel and is tangent to the first shaft wheel; and the encoder is arranged on the second shaft wheel and moves along with the movement of the second shaft wheel. According to the device, the second shaft wheel synchronously rotating along with the first shaft wheel is additionally arranged, and the encoder is arranged on the second shaft wheel, so that the encoder can directly measure the actual speed of the glass tape when rotating along with the second shaft wheel; the problem that in the prior art, due to the fact that an encoder cannot accurately measure the actual spe