Mixer, device and mixing method for continuous production of natural rubber wet mixing

The invention relates to a mixer, a device and a mixing method for continuous production of natural rubber by wet mixing, and the mixer comprises a narrow flow chamber and a carbon black slurry jet pipe; the narrow flow chamber comprises an inner check ring and an outer check ring; the inner check ring is of a conical hollow structure, and a top opening is larger than a bottom opening. The outer check ring is of a conical hollow structure, a top opening is larger than a bottom opening in size, the outer check ring is arranged outside the inner check ring, and a narrow flow cavity is formed between the inner wall and the outer wall of the inner check ring. Latex in a high-pressure state can flow into the narrow flow cavity from the space between the inner wall of the top end of the outer check ring and the outer wall of the top end of the inner check ring, and flows out of the narrow flow cavity in a first water curtain form of a conical hollow structure; the axis of the carbon black slurry jet pipe is vertica