Kitchen wastewater treatment system

The invention discloses a kitchen wastewater treatment system which comprises an oil separation tank, a grating tank, a coagulative precipitation tank, an adjusting tank, a UASB reaction tank, a denitrification tank, a nitrification tank, an ultrafiltration membrane tank, a sludge concentration tank and a centrifugal dehydrator, the centrifugal dehydrator is connected with the sludge thickening tank and the oil separation tank, the sludge thickening tank is constructed to be used for receiving kitchen wastewater and a flocculating agent, the kitchen wastewater and the flocculating agent are mixed with activated sludge in the sludge thickening tank, and mixed waste liquid generated by the centrifugal dehydrator flows into the oil separation tank. According to the kitchen wastewater treatment system disclosed by the invention, the mixed liquid is flocculated and precipitated by adding the flocculating agent, and the chemical oxygen demand, total nitrogen and suspended matters are reducedby utilizing sludge acti