Flexible　scintillators　with　high　light　yield,　spatial　resolution　and　low　light　scattering　are　ideal　for　X-ray　imaging　application.　However,　conventional　scintillators　are　always　prepared　by　crystallization　of　functional　layer,　grinding　and　mixing　with　polymers,　resulting　in　serious　light　scattering.　Herein,　an　in　situ　fabrication　strategy　is　proposed　to　prepare　a　low　light　scattering　flexible　scintillator　film　based　on　0D　antimony　halide　C38H36P2SbCl5　(MTP2SbCl5).　The　prepared　scintillator　film　exhibits　bright　yellow　emission　with　an　outstanding　photoluminescence　quantum　yield　(PLQY)　of　99.69%,　and　it　demonstrates　linear　responsiveness　to　X-ray　dose,　achieving　an　impressive　light　yield　of　39800　photons　MeV-1　and　a　low　detection　limitation　of　78.4　nGyair　s-1.　The　scintillator　film　possesses　strong　radiation　hardness　and　stability.　In　addition,　low　light　scattering　greatly　inhibits　optical　crosstalk　during　X-ray　detection,　effectively　improving　the　spatial　resolution　of　MTP2SbCl5　film　from　4.5　to　10.2　lp　mm-1.　On　account　of　the　simple　preparation　method　and　high　performance,　this　work　provides　guidance　for　the　preparation　of　high-efficiency,　large-area,　low-scattering　and　high-resolution　flexible　scintillator　in　the　future.