Optical gas detection device

The optical gas detection device of the present invention comprises: a light source for emitting light for detecting gas; a light source is introduced into the air chamber pipe; a detection element that detects light; the air chamber pipe is a hollow straight pipe and is made of airtight materials, the inner wall of the pipe forms a reflection surface, a light source on one side of the long and thin hollow pipe is efficiently transmitted to the detection element at the other end, an air inlet is formed in the light source incidence side of the air chamber pipe, and an air outlet of the air chamber pipe is formed in one side of the detection element. A gas cage structure is arranged on the peripheral wall of the gas inlet side of the gas inlet, the gas cage structure comprises a plurality of uniformly distributed gas flow dividing ports, the gas flow dividing ports are directly communicated with the gas inlet and the outer side wall of the gas chamber pipe, and after the gas flow dividing ports directly and un