The invention discloses a bearing oil cooler capable of preventing water leakage. The bearing oil cooler comprises a shell, wherein an oil inlet, an oil outlet, a water inlet and a water outlet are arranged on the shell; a heat transfer tube which has a tubular structure composed of a first tube wall and a second tube wall is arranged in the shell, both the first tube wall and the second tube wall are of single-layer wall structures, and a sealed cavity is formed between the first tube wall and the second tube wall; at least one annular plate inclined to one side is arranged in the sealed cavity, and respectively connected with the first tube wall and the second tube wall, a drain hole is formed in the lower end part of the inclined annular plate, and the bottom of the sealed cavity is connected with an infrared photoelectric leakage detector installed outside the shell. According to the bearing oil cooler provided by the invention, the problem that after the tube wall of the existing oil cooler with a single-tube-wall structure cracks, main equipment may be directly devastated and cannot be repaired can be solved.