Profile and preparation method and application thereof

The invention relates to a profile which comprises a profile body and a core material. A cavity is formed in the profile body and is filled with the core material, the core material can be carbonizedunder the high temperature of 300 DEG C or above, and the carbon yield of the core material ranges from 40% to 60%. The core material comprises a first core material body and a second core material body, the density of the first core material body is larger than that of the second core material body, the first core material body supports the inner wall of the cavity, and the filling ratio of the first core material body in the cavity ranges from 20% to 35%. The filling ratio of the second core material body in the cavity ranges from 20% to 40%. The invention further provides a preparation method and application of the profile. The core material of the profile has good fire resistance, part of the core material is carbonized when high-temperature fires happen outside, the core material cannot be combusted, and when