The invention discloses a salt crystal particle extraction device which comprises a container, a flow guide device and a collecting device, wherein the flow guide device comprises an assembling cavityarranged in the ground, a left water tank and a right water tank which are fixedly arranged on the bottom wall of the assembling cavity, a left flow guide cavity with an upward port is formed in theleft water tank, a right flow guide cavity with an upwards port is arranged in the right water tank, and a first inclined plane and a second inclined plane are respectively arranged at the lower endsof the right flow guide cavity and the left flow guide cavity, a first air opening and a second air opening are formed in the lower ends of the first inclined plane and the second inclined plane respectively, the lower end of the first air opening is provided with a first flow guide pipe connected with a sewage discharging system, a mounting hole is formed in the upper end of the right end wall ofthe left flow guide cavity, a conical hopper is arranged in the mounting hole, the lower end of the conical hopper is rotatably mounted in the mounting hole through a first rotating shaft, a conicalgroove with an upward opening is formed in the conical hopper, a hollow tube connected with the container is arranged in the top wall of the assembling cavity; and a pushing structure used for drivingthe conical hopper to rotate towards the right water tank is arranged in the left end wall of the assembling cavity.