The invention relates to a detection device for sampling particulate matter and
gaseous pollutants contained in
exhaust gas of a stationary
pollution source, in particular to a filter cylinder device of a sampling gun. The filter cylinder device of the sampling gun comprises an outer cylinder, a sampling gun
nozzle mechanism, a
glass fiber filter cylinder and a filter cylinder taking device, wherein one end of the outer cylinder is open, a gas outlet for communication between the inside and the outside of the outer cylinder is formed in the
tail end of the other end of the outer cylinder, the sampling gun
nozzle mechanism is installed at the open end of the outer cylinder in a screwed mode, the filter cylinder taking device is installed on the sampling gun
nozzle mechanism in a hung-connected mode and is located in the outer cylinder and is in sleeving connection with the
glass fiber filter cylinder, and the open end of the
glass fiber filter cylinder is connected with the sampling gun nozzle mechanism. The filter cylinder device of the sampling gun has the advantages that the filter cylinder device is simple in structure and convenient to use, the filter cylinder in the device is convenient to take and is not damaged, and a sampling-detecting result is more accurate.