The invention relates to a new high-
nitrogen organic 
sewage treatment biochemical 
denitrification process. The process mainly comprises the following technical steps of: 1, feeding raw 
sewage which accords with conditions into an upflow 
anaerobic sludge blanket (UASB); and simultaneously feeding reflow 
mixed solution of a subsequent oxidation 
nitration tank (O1) and a part of thick solution of a 
membrane bioreactor (MBR) ultra-
filtration membrane separation device into the UASB; 2, simultaneously feeding 
effluent of the UASB, a part of thick solution of the MBR ultra-
filtration membrane separation device and air into the oxidation 
nitration tank (O1); 3, feeding the 
effluent of the O1 tank into a 
denitrification tank (a tank A) of anoxic zone / aerobic zone A / O(2), simultaneously feeding the remaining 
sludge of the UASB and replenishing carbon, forming an anoxic condition at the tank A to perform 
denitrification, replenishing the part of thick solution of the MBR ultra-
filtration membrane separation device and supplying air (
oxygen) into the O(2) tank to further perform oxidation 
nitration reaction respectively, and removing 
chemical oxygen demand (COD), 
biochemical oxygen demand after 5 days (BOD5), 
total nitrogen (TN) and NH3-N; and 4, feeding the 
effluent of the A / O (2) into the MBR ultra-
filtration membrane separation device, intercepting the active 
sludge and macromolecularCOD and enriching in the thick solution; feeding the thick solution into the UASB, the O1 tank and the A / O (2) tank respectively; performing 
sludge dehydration treatment on the remaining thick solution; and removing the COD and the BOD5. The 
total nitrogen removal rate of the technology is improved by over 50 percent.