The invention relates to a method for detecting a gas line defect of a
glass tube, and belongs to the technical field of measurement and testing. The method comprises the following operation steps of: a, by three groups of shooting equipment arranged on a
glass tube pulling wire, carrying out shooting on the
glass tube and acquiring image information according to a set frequency, and transmitting the image information to a processor; b, by the processor, analyzing each image information and judging whether a gas line exists on a glass tube section corresponding to the each image information; c, when a judgment result is that the gas line does not exist on the glass tube, determining the section of the glass tube as a qualified product; d, when the judgment result is that the gas line exists on the glass tube, by the processor, calculating out a length L1 of the gas line, and comparing the length L1 with a preset gas
line length standard value L; e, when N1 is greater than or equal to N, determining that the section of the glass tube is an unqualified product; f, when N1 is smaller than N, determining that the section of the glass tube is a qualified product. The method is high in reliability and high in working efficiency, and not only can be coordinated with the beat of a
production line, but also ensures body health of an operator.