The invention discloses a device for quantitatively mixing double chemical liquid reagents. The device comprises a mixing box, a material adding motor, a feeding turnplate, a first drive motor, a cam, a second drive motor and a ripple spoiler, wherein the upper side of a support post is fixedly provided with the mixing box, the lower end of an output shaft of the material adding motor is fixedly connected with the feeding turnplate, a stirring shaft is also fixedly provided with a gear, the rear side of the gear is meshed with a rack, the left and right sides of the rack are provided with pothooks, the pothook is connected with a connecting rope, a housing of the left side of the mixing box is further slidingly provided with a connecting rod, and the connecting rod extends into the mixing box and is fixedly connected with the ripple spoiler. By adopting the liquid mixing device, material adding at intervals can be realized, and quantitative material adding can be realized by controlling the rotary speed of the material adding motor; spoiling can be performed inside the mixing box by the ripple spoiler, so that a layering phenomenon appearing during mixing can be effectively avoided, and the mixing effect is improved to the greatest extent.