The invention provides a solar slurry stirring device. The solar slurry stirring device comprises a stirring barrel, a barrel cover, a spiral lifting pipe, a spiral lifting blade, a central shaft, a rotating disc, a stirring rod, a stirring motor and a driving block, a conical sliding surface is arranged at the bottom of the stirring barrel, a platform surface is arranged at the bottom end of the conical sliding surface, a discharging opening is formed in the middle of the platform surface, a spiral lifting pipe is arranged above the discharging opening, the central shaft is arranged in the spiral lifting pipe, the spiral lifting blade is fixed outside the central shaft, and the top end of the central shaft penetrates out of the barrel cover and is in driving connection with the stirring motor; at least one group of driving blocks are further fixed outside the central shaft, the top end of the rotating disc is rotationally connected to the barrel cover, driving notches used for being matched with the driving blocks in an inserted mode are further formed in the bottom side of the rotating disc, and at least one group of stirring rods located between the spiral lifting pipe and the stirring barrel are further fixed to the bottom side of the rotating disc. The stirring cost is low, the stirring uniformity is better, and precipitated dry powder at dead angles can be better eliminated so that the stirring effect is better.