A superconducting film of (Li1-xFex)OHFeSe is reported for the first time.The thin film exhibits a small in-plane crystal mosaic of 0.22°,in terms of the full width at half maximum of the x-ray rocking curve,and an excellent out-of-plane orientation by x-ray φ-scan.Its bulk superconducting transition temperature Tc of 42.4 K is characterized by both zero electrical resistance and diamagnetization measurements.The upper critical field Hc2 is estimated to be 79.5 T and 443 T for the magnetic field perpendicular and parallel to the ab plane,respectively.Moreover,a large critical current density Jc of a value over 0.5 MA/cm2 is achieved at ～20K.Such a (Li1-xFex)OHFeSe film is therefore not only important to the fundamental research for understanding the high-Tc mechanism,but also promising in the field of high-Tc superconductivity application,especially in high-performance electronic devices and large scientific facilities such as superconducting accelerator.