Wastewater treatment device

The utility model relates to a wastewater treatment device, which belongs to the field of sewage treatment equipment, the wastewater treatment device is provided with a filter tank, an air floatation tank, an adsorption tank and a biochemical tank, experimental wastewater enters the filter tank to be stored, a flocculant is added from a chemical inlet pipe at the top of the filter tank, and the flocculant is mixed with the wastewater through stirring of a stirring roller; the mixed wastewater is settled in the filtering tank, floccules with large volumes are blocked on the left side by the separation net and are recycled through the slag outlet pipe, floccules with small volumes enter the air floatation tank through the separation net and the communicating pipe, gas is introduced into the air inlet pipe at the bottom of the air floatation tank, bubbles can carry the floccules in the wastewater to float upwards and flow out from the foam outlet pipe, and the air is discharged through the slag outlet pipe; wate