The invention discloses a gain-adjustable surface acoustic wave micro-gyroscope based on graphene thin films. The gain-adjustable surface acoustic wave micro-gyroscope comprises a piezoelectric substrate, a surface acoustic wave resonator and a surface acoustic wave detector and is characterized in that the surface acoustic wave resonator comprises interdigital transducers, metal lattices are arranged between the interdigital transducers, and reflectors and sound absorption rubber are arranged on the outer sides of the interdigital transducers; the surface acoustic wave detector comprises delay lines symmetrically arranged on two sides of the surface acoustic wave resonator, and the delay lines are parallel with the surface acoustic wave resonator; each delay line comprises a pair of single-phase one-way interdigital transducers, one graphene thin film, a metal electrode I and a metal electrode II, the graphene thin film is arranged between the single-phase one-way interdigital transducers and provided with the metal electrode I and the metal electrode II, and the metal electrode I and the metal electrode II are vertical to the acoustic wave propagation of the surface acoustic waveresonator. The gain-adjustable surface acoustic wave micro-gyroscope has the advantages that by applying voltage to the electrodes to form electric fields, Coriolis effect secondary surface acousticwave gain is regulated, and the sensitivity, accuracy and stability of the micro-gyroscope are increased effectively.