The folded plate flocculation device consists of a tank body and a folded plate assembly. By placing a certain number of alternating inverted folded plates in the flocculation tank, a tortuous waterway with the same or different widths is formed. The water flow repeatedly contracts, expands, and bends between the folded plates, generating a large number of small eddies and accelerating the collision of suspended particles in the water. Under the action of flocculants, large flocculants gradually form and settle down. According to the direction of water flow, it can be divided into two categories: vertical flow (also known as herringbone flap flocculation tank, water flows back up and down, energy utilization is concentrated) and horizontal flow (water flows back horizontally); According to the arrangement of folded plates, they can be divided into same wave folded plates (adjacent folded plates have synchronized peaks and valleys, and the water flow is tortuous) and different wave folded plates (adjacent folded plates have staggered peaks and valleys, and the water flow is scaled alternately); Divided into single channel and multi-channel based on the number of channels. The commonly used folded plate materials are stainless steel, UPVC, ABS engineering plastic, and fiberglass, etc., and the applicable water temperature generally does not exceed 40 ℃ (PVC material).