The invention provides an indoor positioning method and an indoor positioning system. The indoor positioning method comprises the steps of acquiring a signal strength value of a signal which is received by each signal receiving end and transmitted from a target signal transmitting end; calculating a distance ratio between two signal receiving ends and the target transmitting end according to the signal strength values which are received by every two signal receiving ends, and performing traversal of all signal receiving ends for obtaining a plurality of sets of distance ratios; drawing the track of the target signal transmitting end according to position coordinates of every two signal receiving ends and the corresponding distance ratio; and solving according to a fuzzy map strategy according to a plurality of tracks of the target signal transmitting end, thereby obtaining the position coordinate of the target signal transmitting end. The indoor positioning method and the indoor positioning system is based on a differential positioning theory. By means of a principle that wireless signal microscale multipath effect attenuation in the same environment is approximately same, according to a plane geometry principle and a fuzzy map method, interference factors such as multipath effect in a wireless signal indoor transmission process are eliminated, thereby realizing indoor target positioning and improving indoor positioning precision.