As one of the harmful elements in coal,it is essential to investigate the migration,occurrence and leaching characteristics of fluorine in power plant coal and combustion products to control the migration behavior of fluorine during coal combustion and the potential risk of solid waste. This paper took the coal and combustion products of coal-fired power plant as the research object,the distribution of fluorine in coal-fired power plants was studied through the mass balance of fluorine,the occurrence of fluorine in coal and combustion products of coal-fired power plant was analyzed  by scanning electron microscope-energy spectrum (SEM-EDS) and step-by-step chemical extraction test. On this basis,the leaching characteristics of fluorine were studied by standard toxicity leaching method TCLP and HJ/T300—2007"Solidwaste-Extraction procedure for leaching toxicity-Acetic acid buffer solution method" leaching test. The results show that fluorine is a volatile element. After combustion,fluorine in coal is mainly distributed in flue gas and captured by desulphurization gypsum,followed by fly ash,and only a small part of fluoride with good high temperature stability remains in slag. Fluorine in coal and slag is dominated by residual fluorine existing in aluminosilicate minerals. The transformation of residual fluorine during combustion and the adsorption of fluorine in flue gas by fly ash increase the proportion of active fluorine in fly ash,and the proportion of active fluorine in fly ash is 63%-68%. Desulphurization gypsum is mainly residual fluorine,and the proportion of active fluorine is 38%-50%. The leaching test results show that the leaching amounts of different samples in coal-fired power plant is between 0.12-27.31 μg/mL,which is lower than the limit of fluorine concentration in hazardous waste leaching solution. The leaching of fluorine is mainly related to the occurrence state and environment of fluorine. In the mild environment,the ion exchangeable fluorine in the solid sample will affect the environment,and in the acidic environment,ion exchangeable fluorine and carbonate bound fluorine are the main reasons that affect the fluorine pollution in the environment.