The invention discloses a pay-off rack. The pay-off rack comprises a telescopic device, wherein the middle part of the telescopic device is provided with a USB interface, a level bubble, a data receiving module, a microcomputer and a screen connected with the microcomputer; two first ranging probes and two second ranging probes are uniformly distributed along the length direction of the telescopicdevice; the first ranging probe and the second ranging probe are both provided with a data transmitting module; two adjusting frames which are vertical to the telescopic device are arranged on the telescopic device; the telescopic device can slide and adjust along the up-and-down direction of each adjusting frame; the data transmitting module is used for transmitting the detection data of the first ranging probe and the second ranging probe; the received measurement data is displayed by the microcomputer screen. On the one hand, the accuracy of the measurement can be effectively improved; onthe other hand, one person can complete the measurement which reduces the labor intensity of the operator. The pay-off rack has the beneficial effects of being difficult to damage, simple in operation, low in manufacturing cost and the like.