The invention provides a novel fluid pipeline adapter substitute. The fluid pipeline adapter substitute comprises an adapter substitute nut, an adapter substitute core, and a connecting pipe connected at one end of the adapter substitute core, wherein the other end of the adapter substitute core connected with the connecting pipe is provided with a gasket; the inner ring threads of the adapter substitute nut are provided with an air guide groove; the cross section of the air guide groove is in an inverted V shape; the other end of the adapter substitute core connected with the connecting pipeis also provided with a bell; and the gasket can be embedded into the bell. The pressure can be released from the air guide groove and cannot burst out suddenly and cause safety accidents when the air guide groove of the fluid pipeline adapter substitute is disassembled from the adapter substitute. The adapter substitute core transforms vibration force to a stainless steel core by using a form ofa high-quality stainless steel material and a red copper sealing gasket, so that the problem that pipelines are broken due to vibration is solved. The copper gasket for sealing is embedded into the adapter substitute core, has the same conical surface as the adapter substitute core, is embedded into the groove and is not easy to drop out. In addition, the red copper gasket is softer than the stainless steel material and is matched with the stainless steel material for making sealing easier.