The invention belongs to a pile foundation technology, and relates to improvement to a connecting method for a grouting pipe and a reinforcement cage in pile foundation post grouting construction. The connecting method is characterized by comprising the following connecting steps: additionally arranging fixed stiffening ribs (5); and bundling the grouting pipe. The improved connecting method for the grouting pipe and the reinforcement cage disclosed by the invention can prevent the grouting pipe and the reinforcement cage from generating relative displacement when the reinforcement cage is backwards inserted, so that a pile-end grouting valve is prevented from entering a lower end opening of the reinforcement cage, and therefore the grouting valve can be ensured to be smoothly opened.