The utility model discloses a fluorine plastic steel air heater with anticorrosively prevent stifled function, fluorine plastic steel pipe and 2 tube sheets that set up respectively at fluorine plastic steel pipe both ends of arranging including a plurality of parallel intervals, fluorine plastic steel pipe manage the cladding stainless steel for fluoroplastics and control, fluorine plastic steel pipe both ends be in through expand tube technology fixed connection respectively the tube sheet on, fluorine plastic steel pipe side wall surface enter the mouth to the pre -heater flue gas. The utility model discloses can solve traditional steel air heater and easily take place low temperature corrosion, be stained with grey slagging scorification scheduling problem, simultaneously, overcome general plastics heat exchanger, the fluoroplastics pipe is because the pipe wall is too thin, under flue gas scouring action, easily takes place the shake and is out of shape, influence working life and heat transfer performance's shortcoming, can prevent air heater low temperature corrosion, enables the fluoroplastics tube bank again and keeps original design form, the difficult emergence to shake the deformation the flue gas washes away under.