High-performance　self-cleaning　coatings　are　highly　desired　by　the　industry　and　market.　Herein,　we　synthesized　two　kinds　of　ultrafine　TiO2　nanocrystals,　one　is　anatase　dots　with　a　diameter　of　5　nm,　and　the　other　is　rutile　rods　with　1.5　nm　in　width　and　7　nm　in　length.　The　prepared　TiO2　nanocrystal　is　highly　dispersed　and　stable　in　water　over　a　month.　The　coating　can　be　fabricated　via　a　simple　spraying　method,　displaying　excellent　optical　properties　and　photocatalytic　performance　on　self-cleaning　and　surrounding　environment　remediation.　The　transmittance　of　glass　remains　80%-90%　for　visible　and　near-infrared　light　after　30　cycles　of　spray.　RhB　solution(50　mg/L)　was　applied　to　the　coating　surface　and　form　a　solid　RhB　layer　was　formed,　which　can　be　completely　removed　in　30　min＇s　light　irradiation.　RhB　aqueous　solution(100　mL,　5　mg/L)　was　purified　after　180　min　by　a　10　cmx10　cm　glass,　on　which　the　coating　was　sprayed　30　times.　The　concentrations　of　formaldehyde　and　PM　2.5　in　surrounding　air　displayed　a　significant　decrease　along　50　min＇s　monitoring.　This　high-performance　coating　shows　great　potential　for　constructing　functional　coating　on　various　substrates　for　industrial　applications.