The present invention provides a solid powder continuous mixer, which comprises a rotating main shaft, a material inlet, a stirring mixing chamber, a stirring paddle, a powder sprinkling disk, an external cylinder, a flow baffling blending member and a rotating material discharge valve, wherein the rotating main shaft is respectively connected to the stirring paddle and the powder sprinkling disk, the material inlet is connected to the stirring mixing chamber, the stirring paddle is connected to the powder sprinkling disk, the flow baffling blending member is connected to the external cylinder, and the rotating material discharge valve is arranged undermost below the mixer. According to the present invention, the solid powder continuous mixer has characteristics of reasonable design, easy use, stable material inlet and outlet, no clogging, uniform mixing, and good application prospect.