The invention relates to the technical field of logistics equipment, in particular to a cable coaster for a crane. The cable coaster comprises a left side plate and a right side plate which are opposite leftwards and rightwards. The side, facing the right side plate, of the left side plate is provided with a row of spaced left pulleys in the front-and-back direction. The side, facing the left side plate, of the right side plate is provided with a row of spaced right pulleys in the front-and-back direction. The axial direction of the left pulleys and the axial direction of the right pulleys are all arranged in the horizontal direction. Buffering equilibrium devices are installed at the positions, between the adjacent left pulleys, of the left side plate. Buffering equilibrium devices are also installed at the positions, between the adjacent right pulleys, of the right side plate. A lower reinforcing plate is fixed between the lower portion of the left side plate and the lower portion of the right side plate. A row of installing struts arranged in the front-and-back direction are connected under the lower reinforcing plate. A cable supporting plate in an arc arched shape is fixed to the row of installing struts. The structure is firm, operation is smooth, safe and reliable, and the service life is long.