An oil-storing device for a bike saucer-brake includes two oil-storing chambers formed in an interior of a grip, a plate separating the two oil-storing chambers. The plate has a hole communicating two oil-storing chambers for brake oil to flow through. Further, an oil delivery pipe is provided inserting into an outlet tubular portion of the grip, extending inward to reach on the plate, communicating with either of the two oil storing chambers through a sucking hole. Thus, the two oil-storing chambers can store more oil, sucking in oil back to prevent snap locking of the brake from happening. Therefore the device insures safety of a rider in riding even if a bike inclines.