Cold-formed thin-walled steel fireproof structure

The utility model relates to the technical field of constructional engineering steel structures, in particular to a cold-formed thin-walled steel fireproof structure, and aims to solve the problem that an existing light steel structure building lacks effective fireproof measures. The thermal insulation board comprises a thermal insulation board, a cement fiber board and anti-crack cement mortar, the cement fiberboards are mounted on two sides of the insulation board; the insulation board comprises a light steel keel frame, and the light steel keel frame is filled with an EPS material; ePS particles are uniformly distributed in the cement fiberboard; the anti-crack cement mortar is brushed on the face, away from the heat preservation board, of the cement fiberboard. The fireproof performance of the heat insulation board is improved through the EPS material in the heat insulation board and the cement fiber board added with the EPS particles. When the light steel keel frame is heated, the temperature rise speed