The utility model discloses an underground laying cable pay-off pulley, and aims to provide an underground laying cable pay-off pulley that is capable of reducing labor intensity and preventing abrasion of a protection tube. The technical scheme is achieved in the following mode that the underground laying cable pay-off pulley comprises a semicircular pipe channel board, two side walls of one end of the semicircular pipe channel board are respectively welded with an outwardly protruded arc-shaped connecting plate, a fixed shaft is installed between the middle portions of the two connecting plates, a pay-off pulley wheel is installed on the fixed shaft through bearings, and two ends of the fixed shaft are respectively provided with U-shaped clamping rings. When the underground laying cable pay-off pulley is used, a trailed cable is only required to pass along the pulley wheel and a pay-off groove, the underground laying cable pay-off pulley is convenient to carry, install and use, the abrasion of the protection pipe can be effectively prevented, and labor intensity is reduced.