NOVELTY - Carbon nanotube/poly (Schiff base) polymer comprises polyschiff base which is grafted on carbon nanotube, and amination carbon nanotube obtained by polymerizing aromatic diamine monomer and aldehyde group compound. The aromatic diamine monomer and aldehyde group has molar ratio of 1:1, and is 10% of total mass of carbon nanotube/poly (Schiff base) polymer.    USE - Carbon nanotube/poly(Schiff base) polymer used in zinc-tin-selenium photoelectric material for producing electrochromic display device (claimed), e.g. display and acid base sensor.    ADVANTAGE - The polymer has electrochromic, thermochromic acid, and photo-induced color change property, and has good thermal stability.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of carbon nanotube/poly(Schiff base) polymer by weighing amination carbon nanotube, aromatic diamine monomer and aldehyde group compound, and performing acyl chlorination and amination, preferably by dissolving pre-weighed amination carbon nanotube and half of pre-weighed aldehyde compound in organic solvent A to obtain system A; weighing aromatic diamine monomer and dissolving in organic solvent B to obtain system B; dissolving remaining half portion of aldehyde group compound in organic solvent C to obtain system C; dividing system B into three portions at same volume ratio to obtain systems B2 and B3; dividing system C into three portions at same volume ratio to obtain systems C2 and C3; introducing system A in four-necked bottle under protection of nitrogen atmosphere; stirring; heating and refluxing at 130-160 degrees C; dropping return liquid after injecting for 30 minutes; injecting systems B2 and C2 into four-necked bottle for 30 minutes; further injecting systems B3 and C3 into four-neck bottle; maintaining bottle under protection of nitrogen atmosphere at 130-160 degrees C; heating and refluxing for 18-24 hours; adding reaction system into methanol; filtering to obtain solid; adding solid with methanol and standing for 10-36 hours; and vacuum drying to obtain carbon nanotube/polyschiff base polymer.