The utility model provides an on - -spot calibrating device of plumb line system of shifting, include: roof, slip table, first digimatic micrometer, second digimatic micrometer and anchor clamps, the bottom of roof is provided with hooking device, the slip table includes: first sliding layer, second sliding layer, third sliding layer, intermediate level and rotation layer, first sliding layer and roof fixed connection, a line track and a spring coupling are straightened through first steel ball to first, two sliding layers, through straight line track of second steel ball and the 2nd spring coupling between second, three sliding layers, third sliding layer and intermediate level fixed connection, intermediate level and rotation layer are connected through the pivot, the outside that the outside of second sliding layer was provided with first digimatic micrometer third sliding layer is provided with the second digimatic micrometer, the top and the bottom of rotating the layer of anchor clamps are connected, the bottom of anchor clamps is provided with the clamping part that is used for the centre gripping to treat the plumb line system of shifting of calibration. Use the utility model discloses the plumb line system of shifting that can treat the calibration carries out on -the -spot two -way calibration.