The invention discloses a chip structure of an surface acoustic wave sensor. The structure comprises a piezoelectric substrate (21) and an interdigital transducer (20), wherein the interdigital transducer (20) comprises a bus bar (22) and an electrode part (23); the electrode part (23) adopts a sharp corner structure; the piezoelectric substrate (21) is used for accumulating electric energy; and the interdigital transducer (20) is used for converting the electric energy into mechanical energy, modulating an acoustic wave signal on a propagation path, converting the mechanical energy into the electric energy through an inverse piezoelectric effect and providing the energy for the surface acoustic wave sensor. According to the structure, the reading-writing range of the SAW sensor can be greatly expanded, so that longer-distance receiving is realized and the demands of a sensor market on the reading-writing range are met.