The present invention relates to a fusion protein comprising small heat shock protein, a cage protein formed thereby, and novel use thereof, more particularly, a fusion protein comprising a small heat shock protein, a recognition site of a protease, and a histidine polymer, wherein the recognition site and the histidine polymer are sequentially linked to a carboxyl terminal of the small heat shock protein, a cage protein formed thereby, and novel use thereof. The fusion protein of the present invention, and a cage protein formed by the self-assembly properties of the fusion protein are not cytotoxic, and emits a fluorescence signal of about 20 to about 50 times higher comparing to a single peptide for the conventional molecular imaging, per unit protein. Additionally, cell permeability is very excellent, thereby to be effectively used as a biosensor or a bioactive material carrier.
