The invention provides a fluorescent sheet emitted light performance test apparatus and method. A temperature control apparatus consists of a temperature control base and a top cover which are arranged in a laminating manner, wherein the top cover is provided with a plurality of installation grooves at intervals along the length direction, and an LED exciting light source is arranged in each groove; the top cover is externally connected with a constant-current source and integrated with a circuit for driving the LED exciting light source; the temperature control base contacts the LED excitinglight source in a heat conducting manner; the constant-current source drives the LED exciting light source to emit exciting light; a plurality of fluorescent sheets are arranged on a fluorescent sheetbase, a motion controller controls one of the plurality of fluorescent sheets to move into a transmission path of the exciting light, so that the emitted by the fluorescent sheet 2 after being excited by the exciting light is received by a probe and transmitted to a CCD spectrometer; the CCD spectrometer 4 converts a light signal to an electric signal and transmits the electric signal to a computer; and the computer processes the electric signal from the CCD spectrometer, so that the spectrum acquisition and data analysis of the light emitted by the fluorescent sheet can be realized.