The invention discloses a flow regulator for supplying cooling water to equipment, and belongs to the technical field of water flow regulation and distribution. The invention has an outer sleeve, the opening of the right end of the outer sleeve is provided with a cover, and the side wall of the outer sleeve is provided with a relative water inlet and water outlet; the outer sleeve is slidably installed with an inner sleeve with a closed right end and an open left end A piston is installed on the outer wall of the inner sleeve to the left, a guide ring is installed on the outer wall of the inner sleeve to the right, and the outer wall of the inner sleeve is provided with evenly arranged permeable holes at the positions opposite to the water inlet and the water outlet; An adjusting bolt is installed on the cover body of the barrel; the inner end of the adjusting bolt is located inside the cover body, and an adjusting spring is connected between the inner end of the adjusting bolt and the right end of the inner sleeve. The invention has a simple structure, can set and adjust the pressure according to actual requirements, and solves the problem that the equipment cannot be cooled normally when the pressure of the cooling water in the cooling system is too low.