The utility model discloses an oil pipe descaling device. Wherein the supporting mechanism is used for supporting an oil pipe, the descaling main body is used for being arranged in the oil pipe, the descaling main body is provided with a first end and a second end which are opposite to each other, a hollow guide drill bit is arranged at the first end, a water spraying opening is formed in the guide drill bit, and a descaling liquid channel communicated with the water spraying opening is formed in the descaling main body; a descaling blade and an annularly distributed guide mechanism are sequentially arranged on the peripheral wall of the descaling main body from the first end to the second end; the power mechanism is used for providing rotating force for the descaling main body and comprises a rotating shaft connected with the descaling main body, a transmission mechanism for driving the rotating shaft to rotate and a motor; the rotating shaft is matched with the oil pipe in length; and the liquid supply mechanism comprises a connecting pipe communicated with the descaling liquid channel and a water pump arranged on the connecting pipe. The oil pipe descaling device provided by theutility model can better meet the requirement of oil pipe cleaning, and has higher reliability in use.