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Organic–inorganic halide CH3NH3PbI3（MAPbI3） perovskite solar cells（PSCs） have attracted intensive attention due to their high power conversion efficiency and low fabrication cost.However, MAPbI3 is known to be very sensitive to humidity, and the intrinsic long-term stability of the MAPbI3 film remains a critical challenge.2-Aminoethanethiol（2-AET） was used as a ligand to bridge the organic compound（MAI） and inorganic compound（PbI2）, which restricts the fast growth of PbI2 to realize the synchronous growth environment of MAI and PbI2 crystals, resulting in the formation of a compact MAPbI3 film with polygonal grains.Due to the compact（PbI2）–2-AET–（MAI） molecule barrier layers in the MAPbI3 structure, the resulting perovskite films showed excellent intrinsic water-resistance, with the MAPbI3 perovskite crystal structure retained for a long time（>10 minutes） after immersion in water.This work makes a step towards obtaining long-term stable MAPbI3 perovskite devices.In addition, thiourea was introduced into the MAPbI3 precursor for monolithic grains, the perovskite solar cells performed an impressive 18.46% power conversion efficiency（PCE） and average PCE of 17.57±1.03%.Recently, the average grain size of MAPbI3 film about 5 mm was prepared.The PCE of the solar cell based on the film was more than 19%.