A catalytic oxidation thermal resistance type gas phase chromatographic instrument comprises a carburetor, a chromatographic column and a detector; wherein the detector comprises a main body; one or two hollow working cavities are provided horizontally in the main body; a sensor is arranged in the working cavity; one end surface of a body of the sensor is provided with a platinum component coatedwith a catalytic layer and is positioned in the middle part of the working cavity; the other end of the body is connected with the main body through a sealing element and a cover plate; the middle part of the lower part of the working cavity is communicated with the chromatographic column through a connecting pipe sealedly connected with the main body; the upper part of the working cavity is provided with an exhaust gas outlet; a gas inlet communicated with the outer world is provided on the lateral side of the main body which is opposite to the middle part of the working cavity; two ends of the platinum component extends out of one end of the body through a conductor connecting element and is communicated with a detecting and controlling unit; the detecting and controlling unit is communicated with a central controlling and data processing unit. The catalytic oxidation thermal resistance type gas phase chromatographic instrument has the advantages of high sensitivity, wide application, sound safety, stable performance, small dead volume, low operation cost, simple structure and easy operation.