The invention discloses a planar laser induced fluorescence imaging measurement method for simultaneously measuring various constituent messages, relating to the fields of energy source power and optoelectronics and solving the defects that the conventional method only can measure one constituent, but can not completely reflect flow field and combustion process. The method comprises the steps of: carrying out beam combination on the lasers generated by n laser devices to form a beam of laser, then carrying out beam shaping through a sheet beam shaping system, exciting a constituent message in an appointed target area in a target flame by a shaped sheet laser, and generating n different wavelengths of fluorescent lights; orderly separating n different wavelengths of fluorescent lights from a space through a focusing lens and a grating, respectively imaging in n different areas of an area array ICCD (intensified charge coupled device) receiving surface, transmitting n received images to a computer to process and analyze and simultaneously obtaining space distribution messages of n constituents. The method disclosed by the invention can be widely applied to diagnosis of various flow fields and combustion processes so as to provide basic data for researches of combustion science, fluid mechanics and combustion technology.