Anaerobic reactor and reaction system

The invention provides an anaerobic reactor and a reaction system, and relates to the technical field of water treatment.The anaerobic reactor comprises a tank body and a partition bin arranged in the tank body. A water inlet is formed in the top of the tank body, a water inlet area and a water outlet area are arranged in the tank body, and the water inlet is communicated with the water inlet area. A separation area and a reaction area are arranged in the partition bin, the reaction area is divided into a plurality of pre-reaction chambers through baffle plates, the pre-reaction chamber located at the starting end is communicated with the water inlet area, and the pre-reaction chamber located at the tail end is communicated with the separation area; the separation area is used for separating the sludge-water mixture to obtain sludge and purified water. The lifting device is used for lifting the sludge in the separation area to the water inlet area. The baffle plate is matched with the water inlet formed in th