The invention relates to a wingtip check block assembly capable of releasing the pressure stress of a RTM carbon fiber composite aerofoil mold and a method for manufacturing an aerofoil structure by utilizing the wingtip check block assembly. The wingtip check block assembly comprises an elastic pressing block and a wedge-shaped check block, wherein the elastic pressing block is sealed at one endof the mold and is used for receiving the pressure stress generated by the aerofoil structure due to the shrinkage of the mold and releasing the pressure stress through deformation, the wedge-shaped check block is sealed in the mold, is arranged between a wingtip of the aerofoil structure and the elastic pressing block and is used for transmitting the pressure stress to the elastic pressing block,the side surface of the front end of the wedge-shaped check block partially or entirely makes contact with the tail part of the wingtip, the side surface of the rear end of the wedge-shaped check block is entirely attached to one side surface of the elastic pressing block, and the thickness of the wedge-shaped check block is gradually decreased from the rear end to the front end. According to thewingtip check block assembly and the method for manufacturing the aerofoil structure, in the cooling process of the mold, the wedge-shaped check block can move after being slightly stressed and can compress silicon rubber in the moving process, and therefore the pressure stress of the wingtip check block on an aerofoil in the spanwise direction can be automatically released in the shrinkage process of the mold.