The invention relates to a roller pin bush. The roller pin bush comprises multiple first roller pins, multiple second roller pins, a first retainer and a second retainer. The first retainer and the second retainer are each in a barrel shape. The surface, at the inner side, of the first retainer and the surface, at the inner side, of the second retainer are each provided with a groove in a circle. The multiple first roller pins or the multiple second roller pins are each movably mounted in the corresponding groove. The diameter of each roller pin is greater than the depth of the corresponding groove. By means of the roller pin bush, friction force generated in the relative movement process can be remarkably reduced; mechanical efficiency, performance and reliability can be improved; and energy consumption can be reduced. An auxiliary assembling structure of the roller pin bush can assist in assembly of the roller pin bush and also can achieve the fixation and protection effect in the transportation process.