The utility model discloses an elastic rope retainer which is composed of an upper joint, a plate spring and a fishing rod, wherein the upper joint and the fishing rod are connected through threads; the fishing rod is a hollow tubular body; the middle outer tube wall of the fishing rod is provided with an outer shoulder, of which the outer diameter is smaller than the internal diameter of the lower part of the upper joint; the outer shoulder of the fishing rod is provided with a clamping groove; and the plate spring is clamped and connected in the clamping groove. When the downhole rope needs to be fished, the upper joint is connected with a downhole tube, and the fishing rod is connected with a fishing spear hook; in the lowering process of the downhole tube, the plate spring goes down along the sleeve wall and scrapes and extrudes ropes and the like attached to the inner wall of the sleeve, thereby effectively preventing the downhole ropes and the like from running onto the fishing tool, causing stuck accidents; and even if part of impurities are positioned on the fishing tool, when lifting the tube, the plate spring is compressed, thereby effectively avoiding the stuck accidents.