The utility model discloses a chromatography accuracy testing system, be used for responding to the probe of color code signal, the processing terminal who is used for receiving the signal reception subassembly of color code signal and is used for signal processing including what electricity was in proper order connected, the probe is installed on the probe support, and the probe be two at least, presets out horizontal spacing and longitudinal separation between the adjacent probe, still be integrated into signal's signal of the same kind integration including the color code signal that is used for sensing each probe department according to the induction time order and connect, signal integration joint electricity connect in each pop one's head in and the signal reception subassembly between, processing terminal can each signal of analysis duration and the induction time interval between the adjacent signal, can obtain this color code at the offset distance of horizontal direction by the signal duration of color code, can obtain the actual fore -and -aft distance between the adjacent signal according to the induction time interval, processing terminal according to the skew condition that corresponds the color code can next color code of precise adjustment the chromatography position.