The invention provides a function protection material for special continuous casting mould of high-speed heavy rail steel with bloom, wherein the contents of BaO and MgO of the function protection material are 2.0 to 3.0 wt. % and 1.0 to 5.0 wt. %, respectively; the binary alkalinity (CaO/SiO2) is 0.6 to 0.8 wt. % and the rest part of the function protection material comprises SiO2, CaO, Al2O3, Na2O, F and K2O. The function protection material for special continuous casting mould of high-speed heavy rail steel with bloom provided by the invention has the advantages that the spreadability, the heat preservation property and the melting property of the function protection material which is arranged within the mould are good, the heat transfer capacities of the four surfaces within the mould are stable and even, the thickness of liquid slag layer is 7 to 11 mm, the slag strip is little, the lubricating property of the function protection material is good, the phenomenon of sticking breakout is prevented, the surface of the casting blank is prevented from slag inclusion and slag bonding and the quality for the surface of the casting blank is good.