Outer wall external thermal insulation system with fireproof isolation structure

The invention discloses an outer wall external thermal insulation system with a fireproof isolation structure. A fireproof isolation belt needs to be additionally arranged in the construction process of a building outer wall external thermal insulation project made of a non-A-grade thermal insulation material, however, the area of the non-fireproof isolation belt is prone to combustion, the combustion area is uncontrollable, and when the fire behavior is large, the area of the non-fireproof isolation belt can cross the fireproof isolation belt to be combusted, and fire behavior spreading is caused. A composite heat preservation layer is arranged on the outer side of a base layer wall body, the composite heat preservation layer comprises multiple columns of longitudinal plate layers, the multiple columns of longitudinal plate layers are vertically arranged in parallel in the height direction of the base layer wall body, each column of longitudinal plate layer is formed by sequentially and vertically arranging