The invention relates to a water treatment agent raw material high-effective mixing apparatus and belongs to the technical field of water treatment. The apparatus includes: a vertical stirring tank, ahorizontal stirring tank, and a collection bucket. A stirring paddle is vertically arranged in the vertical stirring tank. A first feeding port and a second feeding port are formed on the side wall of the upper end of the vertical stirring tank. A first motor for driving the stirring paddle is installed on the top of the vertical stirring tank. An electric heating sheet is installed on the side wall of the vertical stirring tank. A spiral shaft is horizontally arranged in the horizontal stirring tank. A second motor for driving the spiral shaft is installed on one end of the horizontal stirring tank. By cooperation of the vertical stirring tank and horizontal stirring tank, the raw materials are mixed twice to achieve good mixing effect. Due to the two-time mixing mode, the raw materialscan be fed into and mixed in the vertical stirring tank continuously, wherein the initially mixed raw materials can be continuously fed into the horizontal stirring tank for secondary mixing. The apparatus achieves continuous production and can improve production efficiency.