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This invention discloses a wearable plant humidity sensor and its preparation method, belonging to the field of plant moisture detection technology. The preparation method includes: fabricating Ag interdigitated electrodes on a flexible PET substrate; reacting MA2SnCl6 precursor solution by dissolving MACl and SnCl4·5H2O in a solvent, and optionally optimizing the solution with isopropanol or ammonia; spin-coating the precursor solution onto the electrodes and annealing to form an MA2SnCl6 thin film. This invention is the first to apply lead-free double perovskite MA2SnCl6 to plant humidity sensing. The resulting sensor is flexible, wearable, and deformation-resistant, allowing it to fit closely to plant leaves, enabling real-time, in-situ, and non-destructive detection of surface moisture in living plants (such as pumpkin seedlings). It also boasts advantages such as high sensitivity, good repeatability, and strong stability, solving the problems of interference susceptibility and poor applicability of traditional detection methods.