High-salt high-COD (Chemical Oxygen Demand) wastewater pretreatment equipment

The invention discloses high-salt high-COD wastewater pretreatment equipment which comprises a rack, a base is fixedly arranged at the upper end of the rack, and a filtering tank is fixedly arranged at the upper end of the base; the annular fixing groove is formed in the upper portion of the interior of the filtering tank, four limiting rods are arranged on the lower end face of the interior of the annular fixing groove, a first filtering plate is arranged in the annular fixing groove, and four positioning holes are formed in the outer side of the interior of the first filtering plate; a second supporting spring is fixedly arranged in the annular fixing groove outside the limiting rod, and a first supporting spring is fixedly arranged at the lower end of the tank cover outside the limiting rod. The rotating rod is arranged in the middle of the lower end of the tank cover, and a driving bevel gear is fixedly arranged on the outer portion, located below the first filtering plate, of the rotating rod, and the pr