The utility model provides a cooling device for cast-rolling H-steel. The cooling device comprises an outer shell, three sets of upper spray nozzles, an upper spray pipe, three sets of lower spray nozzles, a lower spray pipe, three sets of left spray nozzles, a left spray pipe, three sets of right spray nozzles and a right spray pipe. The outer shell is of a box-shaped structure. The three sets of upper spray nozzles are located in the outer shell and used for respectively and perpendicularly aligning with two R portions of the upper side face of the H-steel and the center of a web. The upper spray pipe is arranged in the outer shell and connected with the three sets of upper spray nozzles. The lower spray pipe is arranged in the outer shell and connected with the three sets of lower spray nozzles. The three sets of left spray nozzles are located in the outer shell, arranged in sequence in a top-bottom mode and used for perpendicularly aligning with the left side face of the H-steel to enable cooling water to be sprayed towards the left side face of the H-steel evenly. The left spray pipe is located in the outer shell and connected with the three sets of left spray nozzles. The right spray pipe is located in the outer shell and connected with the three sets of right spray nozzles. No interference occurs between cooling water sprayed by each set of spray nozzles. The cooling device for the cast-rolling H-steel enables the H-steel to have a good texture state so as to achieve better comprehensive mechanics properties.