Synchronous denitrification reactor

The invention discloses a synchronous denitrification reactor. The synchronous denitrification reactor comprises a first order reaction chamber, a second order reaction chamber, a inlet water mixing chamber, a carbon source adding pipe, a mixing stirring device, a backwash water pipe, and a spherical filling material; the first order reaction chamber and the second order reaction chamber are connected in series; the first order reaction chamber comprises a first water preparation oxygen release chamber and a fist denitrification chamber; the second order reaction chamber comprises a second water preparation oxygen release chamber and a second denitrification chamber; the bottoms of the first denitrification chamber and the second denitrification chamber are designed to be tapered; the bottom of the first denitrification chamber is provided with a hole; the bottom of the second denitrification chamber is provided with a hole; the outside edge of each of the holes is covered with filling material blocking screen; and the spherical filling material is injected into the first denitrification chamber and the second denitrification chamber. According to the synchronous denitrification reactor, synchronous denitrification anoxic conditions are achieved in an aerobic tank or an anoxic pool via insulation, biomembrane loaded with the spherical filling material is used for reaction of nitrates and nitrites in backflow sewage with the added carbon source, and generated nitrogen overflow, so that denitrification is realized.