Bonding sheet, preparation method thereof and metal foil-clad laminated board comprising bonding sheet

The invention provides a bonding sheet, a preparation method thereof and a metal foil-clad laminated board comprising the bonding sheet. The bonding sheet comprises a reinforcing material and a resin composition for infiltrating and filling the reinforcing material; the reinforcing material is provided with at least one punching area, at least three holes are formed in any punching area, and the diameter of each hole is 0.5-4 mm; and the distance between holes in any one punching area ranges from 0.4 mm to 2 mm, and the minimum distance between every two adjacent punching areas is larger than the distance between the holes. The holes with specific diameters and intervals are formed in the reinforcing material, so that the holes are filled with the resin composition instead of the reinforcing material, the strength of the bonding sheet is not obviously reduced, meanwhile, the heat dissipation performance and the hole filling performance of the punching area of the bonding sheet are improved, and it is ensured