The utility model discloses a three -dimensional positioner in space, place the case including electrical components, the first indicator board of circular shape is installed to the upper end that electrical components placed the case, and the upper end of first indicator board installs a step motor, and a step motor's output installs the horizontally revolving stage, vertical second indicator board and third indicator board are installed to the upper end of revolving stage, electrical components places the incasement and is equipped with DSP the control unit, DSP the control unit is connected with radio signal receiving unit and power supply unit through the electric conductor. The utility model discloses simple structure, design benefit adopts two step motor to control revolving stage and pointer respectively, and two random point longitude and latitude departments that step motor while coordinated movement made the entire system location can fix a position first sphere in space can realize human -computer interaction through radio signal to can clearly show two step motor running state and parameter monitoring data in the host computer.