The utility model relates to a novel pressure roll of a descaling box. The body of the pressure roll is designed to be a structure of which the middle is thick and both ends are thin; the middle part and both end parts of the pressure roll are of a cylinder structure respectively; and parts between the middle part and both ends of the pressure roll are of a conical structure respectively. The novel pressure roll of the descaling box is reasonable in structural design, even in abrasion and long in service life and can be widely used for the technical field of steel rolling.