Abstract: In order to solve the problem of low precision of indoor location algorithm, a set of visible light indoor positioning device which has illuminating function at the same time was designed. First of all, the layout of the indoor light source was arranged according to international standard of illumination. Secondly, a visible light transceiver system of intensity modulation/direct modulation (IM/DM) and an indoor positioning system platform with STM32 as core processor were designed. Finally, the calibration of target coordinates and regions was realized by using the method of multi point calibration relative positioning. The results show that, under the conditions suitable for illumination, measurement error is less than 10cm. The measurement error of partial location area is 3cm or even 0cm. Error resolution is 0.1cm, and relative error is less than 10cm. The research provides a scheme for current indoor positioning technology.