To provide a slurry feeding device having a simple structure and an excellent slurry backflow preventive function and capable of feeding a good quality of slurry having uniformly dispersed solid particles.

This slurry feeding device comprises a tank 2 for receiving, slurry a slurry circulating pipeline 3 for circulating slurry from the lower part to the upper part of the tank 2 to agitate the slurry in the tank 2, a slurry feed pipeline 4 for feeding the slurry in the tank 2 to a production process. A stop valve device 5 formed of a three-way valve allowing the suction and discharge port 6a of a reciprocating pump 6 to communicate therewith is installed between the inlet side pipeline part 4a and outlet side pipeline part 4b of the slurry feed pipeline 4.