The invention discloses an environment-friendly white latex processing device for building. The environment-friendly white latex processing device for building comprises a convective mixing box and asecondary mixing box. The convective mixing box is provided with a feeding port. The secondary mixing box is positioned below the convective mixing box, and the convective mixing box is connected withthe secondary mixing box through an unloading pipe. The bottom of the secondary mixing box is connected with a discharging pipe. The discharging pipe is also provided with a valve. The secondary mixing box is internally provided with a mixing mechanism. The beneficial effect is that convection is performed on a raw material in an operating process of the convective mixing box and the secondary mixing box, after secondary convection, the raw material can be adequately mixed, and finished product quality of white latex is guaranteed.