Dual-fuel oxygen deficit detection device

A dual-fuel oxygen deficit detection device comprises a fuel combustion pipe, an ignition needle and a thermocouple, and the fuel combustion pipe is divided into a liquefied gas pipe and a natural gas pipe; the number of the ignition needles is two. The thermocouple fixing device comprises a thermocouple, and further comprises a base plate, a couple fixing plate piece, a first fastening plate and a second fastening plate, the base plate comprises a couple seat plate part, a liquefied gas pipe seat plate part, a natural gas seat plate part and a fixing seat part, and the couple fixing plate piece fixes the thermocouple on the couple seat plate part; the liquefied gas pipe and the natural gas pipe are fixed to the liquefied gas pipe base plate part and the natural gas rear base plate part respectively through the first fastening plate, and the ignition needle is kept between the first fastening plate and the second fastening plate through the second fastening plate. A screw penetrates through the first fastenin