The support wheel pig of QDQ-Z type is the updated product of simple pig (Patent number: ZL01212169.X). The problem of serious abrasion at the bottom caused by its own weight could not be resolved by the pig itself, especially to the pipeline of long cleaning distant, till that the pig could not be used. Supported by the elasticity arm and rolling wheel, the support wheel pig keeps operate with the pipeline in the same axes. Due to the self abrasion of the pig cup during operation, there is perfect sealing effect and the operation distance of the pig is prolonged. The use life of the pig cup relative to the operating distance of pig can increase three to five times. So the support wheel pig is the most ideal pig product for long transport among the same kinds of product in China.