The invention discloses a miniature grouting steel pipe pile group pile design method. The method is suitable for stratum conditions that the upper portion is a gravel soil layer and the lower portionis a weathered rock layer. The method comprises the following steps: firstly, performing geological survey on a construction scene, determining that stratum conditions of a place meet requirements ofthe method, and calculating a maximum value of a river scouring range; secondly, selecting the pile body diameter, the pile diameter ratio and the steel pipe wall thickness; then selecting pile bodylengths, pile body intervals and pile body arrangement; determining the pile group number according to the pile group upper load; carrying out size design on the bearing platform according to the obtained parameters; and conducting pile group construction according to the obtained parameters, and conducting bearing platform construction on the upper portions of the constructed pile groups. The designed and constructed grouting miniature steel pipe pile foundation is simple in form, the construction cost can be saved, noise pollution can be reduced especially for places with many surrounding people, the construction mode is environmentally friendly, construction is easy, convenient and rapid, and the construction period is short.