A-grade large formwork built-in cast-in-place concrete composite insulation board system

The utility model discloses an A-level large formwork built-in cast-in-place concrete composite insulation board system which comprises a cast-in-place concrete wall body, composite insulation board splicing sets are laid on the outer wall of the cast-in-place concrete wall body at equal intervals, and board edge connecting pieces are arranged on the two sides of the outer wall of one side of the cast-in-place concrete wall body. The composite insulation board splicing set is fixed to the outer wall of the cast-in-place concrete wall through expansion screws arranged at the edges at equal intervals, and the expansion screws located at the two ends of the composite insulation board splicing set also penetrate through the board edge connecting pieces. According to the composite insulation board, the connecting effect between the wallboards can be improved, the situation that a single wallboard is peeled off is avoided, meanwhile, the firmness of the edge wallboards is improved, and the possibility that the edge