The invention discloses a 
nitrogen production device by 
pressure swing adsorption, and belongs to the technical field of 
nitrogen production. The 
nitrogen production device includes a housing and an intake valve installed at one end of the outer side of the housing, a fixing plate is installed at the position, near the intake valve, in the housing, a dust filter screen is arranged at the bottom, on the outer side of the fixing plate, in the housing, a buffer 
assembly is arranged on the side, facing the intake valve, of the fixing plate, the outer side of the dust filter screen is fixed to thehousing, a partition plate is installed at the bottom of the housing, groove bodies are fixedly formed in the inner side of the partition plate and the outer side of the dust filter screen, and the partition plate including the dust filter screen and the housing structure are filled with 
distilled water. According to the nitrogen production device by 
pressure swing adsorption, by opening the intake valve to introduce 
mixed gas into the housing, the high-pressure 
mixed gas collides and buffers with the buffer 
assembly on the fixing plate, the buffered 
mixed gas passes through the dust filter screen and enters the 
distilled water of the partition plate including the dust filter screen and the housing structure for dust removal, the good dust 
removal action is achieved, and thus the nitrogenproduction device by 
pressure swing adsorption can better provide pure nitrogen.