Solid precipitation device and solid precipitation method

Disclosed is a solid precipitation device, comprising a device shell (5), a waste water inlet (1), a discharge port (10) and solid particles (4) arranged in an inner cavity of the device shell (5), wherein the structure of the solid particles (4) is suitable for solid matter to be deposited and adsorbed thereon; the inner cavity of the device shell (5) can also be provided with an inner member, a guide structure (7) surrounding an inner wall of the device shell (5), a heat agent inlet and an inner cylinder (12); the inner member comprises a hollow cylinder (8) substantially coaxial to a central axis of the device shell (5), and an umbrella-shaped cap (9) located above the hollow cylinder (8); the guide structure (7) is arranged at an upper part of the inner cavity of the device shell (5); and the inner cylinder (12) is located below the guide structure (7). Further disclosed is a solid precipitation method. A material containing a solute enters the solid precipitation device, and at least part of the solute is deposited and adsorbed on the solid particles (4) in the solid precipitation device.