The invention discloses a method for preparing a silicon micro-cantilever beam leadless piezoelectric thick film actuator, comprising the following steps: (1) a silicon chip is cleaned so as to generate silicon dioxide and silicon nitride layers; (2) the surface of the silicon chip is etched, the window is eroded and then silicon micro-bridge is etched; (3) the stripping technique is adopted to prepare a Pt/Ti bottom electrode; (4) a printing method is adopted to prepare a leadless piezoelectric thick film and polishing is carried out; (5) the electrode on an AU is deposited and wet etching is carried out to the electrode, and finally one end of the micro-bridge is eliminated so as to obtain the cantilever beam; the invention has the advantages of simple structure and technique, low driving voltage, larger displacement, fast response rate and high harmonic frequency, adopts the compact leadless piezoelectric film with non-toxicity and environmental protection, meets the development trend of current electronic materials and devices, has wide application, can be used as various micro-gripping and driving execution part to change the parameters of sizes and can be used for micro-sensors.