A dynamic power positioning method used in a dynamic power positioning system to find out a device location of a device to be measured in a space, wherein the space further comprises a plurality of known location devices, the method comprises the steps of: controlling the device to be measured to transmit a plurality of positioning signals with a plurality of transmission powers; making the plurality of known location devices to receive the plurality of positioning signals, and recording intensities of the plurality of positioning signals, corresponding reception times of the plurality of positioning signals, and coordinates of the plurality of known location devices to a database; finding out a plurality of known location devices (51, 52, 53) corresponding to positioning signals having a higher signal intensity among the received plurality of positioning signals; obtaining a signal intensity-distance function and a signal intensity-distance standard deviation function from the database; and finding out the device location of the device to be measured according to the signal intensity-distance function and the signal intensity-distance standard deviation function; wherein the step of finding out the device location of the device to be measured is performed by querying the signal intensity-distance function and the signal intensity-distance standard deviation function based on the intensities of the plurality of positioning signals, the corresponding reception times of the plurality of positioning signals, and the coordinates of the plurality of known location devices (51, 52, 53) with higher signal intensities; wherein the dynamic power positioning method further comprises the following step of: obtaining a plurality of probability distribution planes of the plurality of known location devices (51, 52, 53) with higher signal intensities at a plurality of different powers according to the signal intensity-distance function and the signal intensity-distance standard deviation function; obtaining a final probability distribution plane by multiplying the plurality of probability distribution planes with each other; and finding out a location having a maximum probability in the final probability distribution plane to be set as the device location of the device to be measured. controlling the device to be measured to transmit a plurality of positioning signals with a plurality of transmission powers; making the plurality of known location devices to receive the plurality of positioning signals, and recording intensities of the plurality of positioning signals, corresponding reception times of the plurality of positioning signals, and coordinates of the plurality of known location devices to a database; finding out a plurality of known location devices (51, 52, 53) corresponding to positioning signals having a higher signal intensity among the received plurality of positioning signals; obtaining a signal intensity-distance function and a signal intensity-distance standard deviation function from the database; and finding out the device location of the device to be measured according to the signal intensity-distance function and the signal intensity-distance standard deviation function; wherein the step of finding out the device location of the device to be measured is performed by querying the signal intensity-distance function and the signal intensity-distance standard deviation function based on the intensities of the plurality of positioning signals, the corresponding reception times of the plurality of positioning signals, and the coordinates of the plurality of known location devices (51, 52, 53) with higher signal intensities; wherein the dynamic power positioning method further comprises the following step of: obtaining a plurality of probability distribution planes of the plurality of known location devices (51, 52, 53) with higher signal intensities at a plurality of different powers according to the signal intensity-distance function and the signal intensity-distance standard deviation function; obtaining a final probability distribution plane by multiplying the plurality of probability distribution planes with each other; and finding out a location having a maximum probability in the final probability distribution plane to be set as the device location of the device to be measured. obtaining a plurality of probability distribution planes of the plurality of known location devices (51, 52, 53) with higher signal intensities at a plurality of different powers according to the signal intensity-distance function and the signal intensity-distance standard deviation function; obtaining a final probability distribution plane by multiplying the plurality of probability distribution planes with each other; and finding out a location having a maximum probability in the final probability distribution plane to be set as the device location of the device to be measured.