A horizontal mixer is a machine used for mixing. Under the action of the inner and outer screw belts on the mixing shaft, the material is flipped within the range of the cylinder. The inner screw belt pushes the material from the middle to the two sides, and the outer screw belt pushes the material from the two sides to the center. The material that permeates back and forth moves and changes radially under the rotation of the screw belt, forming a convection cycle that enables the material to be quickly and uniformly mixed in a short time. The two end shaft seals are specially sealed, and the powder liquid does not leak. The cost of replacing sealing consumables is low and easy, making it a high-efficiency mixing equipment with wide applications, strong adaptability, and good effects.