The invention relates to an index gain modulation distance imager and relates to the field of photoelectronic imaging. The invention solves the problem of poor ability of acquiring distance of a high-speed moving target caused by low momentary power and long time exposure of the existing device for acquiring distance image of the high-speed moving target. In the index gain modulation distance imager, beams output by a pulsing laser are divided into a first reflected light and a first transmitted light by a first light splitting piece; the first reflected light enters the light sensation end of a photoelectric detector; the first transmitted light is divided into two beams by a second light splitting piece after passing through a transmitting optics shaping system and a receiving optics system and the two beams respectively enter the light input terminals of a first ICCD imager and a second ICCD imager. The output terminal of a modulation signal of a high-voltage modulation power source is connected with a microchannel plate of the first ICCD imager and the output terminal of a current signal of a high-voltage direct current power source is connected with a microchannel plate of the second ICCD imager. The imager can be applied to the fields of remote active remote sensing technology, target recognition technology and robot vision technology, etc.