The present invention relates to a nonmetallic expansion joint. The present invention relates to a connecting pipe comprising a connecting flange for engaging with a piping to which a high-temperature gas is fed, a connecting groove formed at one end of the connecting pipe, and a guide groove extending to the rear of the connecting groove; A nonmetallic expansion and contraction tube inserted into the inner circumference of the connection pipe and configured to have a fixing flange with a fixing groove formed therein to be fixed to the connection pipe and configured to be divided into a corrugated pipe so as to minimize the deformation of the pipe; Metal expansion and contraction tube is fixed to the fixing groove, and a sliding member is coupled to the coupling groove of the coupling tube, and a sliding operation is performed along the guide groove when the non-metal expansion and contraction tube is expanded and contracted A displacement absorbing member; An elastic member provided on the displacement absorbing member and providing a predetermined elastic force during sliding operation; And an elastic supporting member for fixing the elastic member to the displacement absorbing member.
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