The invention discloses a settling control method of a multi-pilot tunnel underneath bridge pile. The settling control method comprises the following steps: a monitoring point and a monitor are distributed on a field bridge pile; a multi-pilot tunnel is divided into different excavation areas; the percentages of influences on settling of the bridge pile by phased construction of the different excavation areas are obtained by a numerical value model and numerical value analysis software, and are multiplied by respective corresponding engineering standard values and added with analogy engineering experience values to obtain control numerical values in all construction phases; settling numerical values of the different excavation areas are obtained by using numerical value analog computation, and are used for determining grouting reinforcing areas with different grades; the grouting reinforcing areas with different grades are reinforced before excavation; field monitoring data is acquired in the field excavation process, and is compared with the control numerical values of all the construction phases; and the grouting intensity and the construction speed are adjusted according to real-time comparing results of the two. The settling control method can control the different settling, the total settling and the settling speed to guarantee the building safety.