The invention discloses a method for controlling cooling water flow of double-roll strip casting rolls. Each casting roll is provided with one or more water inlets and corresponding water outlets. Correspondingly, one or more independent cooling water channels are formed in each casting roll. A water outlet of each cooling water channel is provided with a flow adjusting valve which can adjust the flow of cooling water passing through the cooling water channel. A water pump which can adjust the flow is used for providing cooling water for the two casting rolls. Meanwhile, a flow controller monitors the flow qn of cooling water in each cooling water channel of each casting roll and adjusts the corresponding flow adjusting valve to change the flow of cooling water in the corresponding cooling water channel according to the deviation of the flow qn and the cooling water flow average value in the cooling water channels, finally, the flow in all the cooling water channels in each casting roll is consistent, and therefore the cooling strength in the casting rolls can be even. The method has the beneficial effects that the cooling water flow control precision is high, and the responding speed is high.