The invention discloses a deep hole blasting charging and detonating method for lowering the foundation based on digital detonators. The method comprises steps of drilling; in-hole section division, including a lower charging section, a lower blocking section, an upper charging section and an orifice blocking section; charging in the sections; networking detonation and the like. During detonation,the detonation sequence and the time interval are strictly set through digital detonators. The method is advantaged in that in-hole segmented blasting is carried out, the blasting sequence and the time interval are strictly set through the digital detonators, rockfill generates relative dislocation in space after a front-row lower charging section is blasted, a free face is created for the bottomof a rear-row hole step, the clamping effect of front-row rock on the bottom of the step is reduced, and constraint conditions are changed; moreover, due to the blocking effect of the bottom blockingsection, explosion gas can be prevented from escaping too early, the action time of the explosion gas at the bottom of the hole is prolonged, explosion energy is fully utilized, the stress strength of a chassis resistance line part is improved, rock mass at the chassis part is fully crushed, generation of explosion roots is greatly reduced, and flatness of a bottom plate is improved.