The utility model discloses a space positioning system, this system include at least three beacon and at least one position terminal, the beacon distributes and sets up in position space undetermined for produce the low frequency electromagnetic field, every position terminal receives the low frequency electromagnetic field that a plurality of beacons produced to according to the low frequency electricity magnetic field data that the at least three beacon of received produced, calculation position terminal's spatial position. And simultaneously, the utility model discloses overcome effectively current location scheme implementation complexity high, arrange with high costs, positioning error big, defects such as delays are updated to the locating information, through low -priced scheme, realizes indoor accurate real -time tracking the on a large scale, and is and loose to the environmental requirement broad, no metal, magnetic field interference can, the suitability of space orientation scheme in the environment scene of difference has been improved to apparent landing.