Provided herein is a biocompatible protein, and biocompatible protein gel and conductive protein gel including the biocompatible protein, and preparing method thereof, the amino acid sequence of the biocompatible protein being Lys-X-Lys-Glu-X-Phe-Phe-X-Lys-Glu-X-Phe-Phe-X-Lys-Glu-X-Tyr, X being any one or more of hydrophobic amino acids, and the method including synthesizing a protein that causes no rejections from human bodies and that is not easily degradable, thereby providing an advantage of being utilized as a conductive biomaterial having biocompatibility and biodegradability in regenerative medical fields such as 3D bioprinting.