The invention relates to a naphthalimide fluorescent dichroic dye containing an aromatic ester group and an application thereof, belonging to the field of display materials. In the naphthalimide fluorescent dichroic dye containing an aromatic ester group, naphthalimide is used as the parent body, and an ester group is introduced to 4-site to be directly connected with the parent body so as to achieve negative fluorescent dichroism. The dye has the advantages of novel structure, easy acquisition of raw materials and simple synthesis method. Tests show that this series of dye emits vivid blue fluorescence, the maximum emission wavelength is 405nm, the fluorescence quantum yield is 0.44-0.70, better dichroism can be indicated in liquid crystal MLC6237-01 epsilon, the absorption order parameter is -0.20- -0.23, the dichroic ratio is 2.0-2.3, the fluorescent order parameter is -0.37- -0.38, and the fluorescent dichroic ratio is 5.2-5.7.