The utility model relates to a control valve for mixing cold and hot water, mainly comprising a box body, a movable disc, a fixed disc and a valve base, wherein, the utility model has the maximum circulation area of water flow by means of the arranged shapes of a first, a second through holds and a shell-shaped third through hole on the fixed disc; in addition, the utility model can be matched with a mixing chamber 22 with a larger area on the movable disc, so the water guiding circulation quantity of a valve body can be improved and the efficiency of transporting water flow at more homogeneous temperature can be promoted. Additionally, the utility model can utilize that the structure of the box body can combine valve bases of communicating pipes with different length specifications according to required occasions to form required valve body specifications to achieve the aim of reducing the production cost of the mould of the box body.