The invention discloses a bush roller chain which comprises inner chain plates, outer chain plates, bushes, hinge pins and first rollers, wherein the bushes are provided with extension sections which extend outside the outer side surfaces of the inner chain plates at two sides; diameter expansion hole sections are formed in inner side ends of hinge pin holes for fixedly connecting the hinge pins on the outer chain plates; the diameter expansion hole sections and the corresponding extension sections of the bushes are in rotational connection. Preferably, the outer chain plates consist of first outer chain plates and second outer chain plates; the first outer chain plates are positioned on the outer sides of the second outer chain plates; the small hole sections, matched with the hinge pins, of the hinge pin holes are arranged on the first outer chain plates in a straight through hole structure manner; the diameter expansion hole sections are also of the straight through hole structure and are arranged on the second outer chain plates; the thickness of each second outer chain plate is equal to the length of each upper bush extension section. The bush roller chain has the beneficial effects that through redistribution of power transmission of inner and outer chain plates, the connection abrasion of the chain is alleviated, the loading capacity of the bush roller chain is remarkably improved, the service life of the bush roller chain is prolonged, and the use cost is lowered.