The present invention discloses a metro overall ballast bed stripping amount nondestructive test method and system. The method comprises the following steps of 1 detecting the current situation of an existing running metro ballast bed structure; 2 according to the detection result of the step 1,determining the monitoring range of implementing a static leveling instrument, and laying the static leveling instrument; 3 utilizing the static leveling instrument to test the ballast bed structure vertical displacement amounts of the monitoring points on the conditions that a ballast bed stripping section is loaded and unloaded; 4 utilizing a ballast bed stripping amount calculation formula to calculate the stripping amounts of the different monitoring points of the ballast bed structure. According to the present invention, on the condition that the original structure of the ballast bed is not destroyed, the stripping condition of the metro ballast bed structure is quantified, and the referential data bases are provided for the maintenance and repair of the running metros.