The invention discloses a glass blowpipe which comprises a check valve as well as a gradual flaring port A and a gradual flaring port B which are formed in an inlet and an outlet of the check valve, wherein the check valve comprises a casing, a sealing block, a support plate and a spring, wherein the casing is cylindrical and is communicated with the gradual flaring port A and the gradual flaring port B; the support plate is fixed inside the casing, adopts a hollowed-out structure, and is perpendicular to the axis of the casing; the sealing block is flexibly connected with the support plate through the spring which is made of plastic; and the sealing block is conical, the conical bottom surface diameter is larger than the inner diameter of the gradual flaring port A, and the sealing block is propped and pressed on the gradual flaring port A through the spring. The glass blowpipe can effectively prevent scald generated due to hot air backflow, meanwhile, when blowing is not performed, a sealing pipeline prevents glassware from deformation caused by air escape, and good social benefits are provided.