Abstract: The present invention relates to an apparatus for mixing a solid or liquid chemical into water for solving for preparing a chemical solution. The present apparatus is used for preparing a chemical solution, attached to a channel for solving chemical into water running along the channel., The apparatus is provided with a container having an inlet for introducing water, an outlet for discharging the water introduced from the inlet, a water path extending from the inlet to the outlet, and a chemical room for housing the chemical. According to the present invention, the chemicals housed in the chemical room is solved into water running through the water path. Chemical may be solved easily and safety.