The invention discloses a plasma self-luminous soft X-ray quasi-monochrome imaging apparatus. The apparatus comprise a multi-layer film spherical mirror, a spherical mirror adjustment frame, a multi-layer film plane mirror, a plane mirror adjustment frame, a receiving part and a receiving part adjustment frame; the multi-layer film spherical mirror is mounted on the spherical mirror adjustment frame; the multi-layer film plane mirror is mounted on the plane mirror adjustment frame; the receiving part is mounted on the receiving part adjustment frame; the receiving part comprises filtering sheet pressing rings, a filtering sheet, an IP plate and a bottom sheet box; the IP plate is embedded in the bottom sheet box; the filtering sheet is mounted on the left side of the IP plate; the filtering sheet pressing rings used for fixing the filtering sheet are arranged on the upper end part and the lower end part of the filtering sheet; the spherical mirror adjustment frame, the plane mirror adjustment frame and the receiving part adjustment frame are all three-dimensional adjustment frames; and the central axis of the central points of the multi-layer film spherical mirror, the multi-layerfilm plane mirror and the receiving part coincides with laser beam incident rays. By virtue of the apparatus, interference of hard X rays and visible light on imaging can be eliminated, and soft X-rayquasi-monochrome imaging of to-be-tested plasma can be realized.