Composite fireproof insulation board with multi-layer overlapping structure and composite insulation system

The utility model relates to the technical field of constructional engineering, in particular to a composite fireproof insulation board with a multi-layer overlapping structure and a composite insulation system. The utility model relates to a fireproof thermal insulation board which comprises a board core and inorganic mortar layers arranged on the upper side and the lower side of the board core, the board core comprises at least two layers of thermal insulation boards, every two adjacent layers of thermal insulation boards are connected through a bonding layer, each thermal insulation board comprises a plurality of thermal insulation boards arranged in parallel, and fireproof thermal insulation mortar strips are arranged in board joints between every two adjacent thermal insulation boards. Continuous insulation boards on the whole insulation structure can be achieved, and the situation that a heat bridge is generated due to the fact that an inorganic slurry layer is communicated can be avoided. And each laye