A linear guideway with quick release oil tanks comprises: a rail, a slide block disposed on the rail, connectors and an oil tank disposed at an ends of the slide block. The oil tanks is "II"-shaped and includes a base portion and two extension portions, a distance between the two extension portions is larger than a maximum width of the rail, and a maximum width of the base portion of the oil tanks is shorter than a distance between an upper surface of the rail and a top surface of the slide block. The connectors each have a connecting portion and an engaging portion, and is axially defined with a through hole, and the oil tanks are defined with an oil outlet for engaging with the engaging portion of the connectors.