The invention relates to an inclined type slag roller supporting and fixing device. The inclined type slag roller supporting and fixing device is characterized by comprising a roller body, a transmission device, front supporting wheel assemblies, rear supporting wheel assemblies, a thrust wheel assembly, a front supporting wheel base and a rear large base, wherein the transmission device is arranged on the lower part of the roller body; the two groups of the front supporting wheel assemblies are separately arranged at the left side and the right side of the roller body; the front supporting wheel assemblies are mounted on the front supporting wheel base and fit to the peripheral surface of a front welding supporting ring fixedly arranged on the roller body; the left and right groups of therear supporting wheel assemblies are mounted on the rear large base, and fit to the peripheral surface of a rear welding supporting ring fixedly arranged on the roller body; and the roller body is arranged between the front supporting wheel assemblies and the rear supporting wheel assemblies, so that radial positioning for an inclined roller is realized.