Plant-based fluoroprotein foam extinguishing agent is a novel fire suppressant developed by adding fluorocarbon surfactants and other components to plant protein foam extinguishing agents. It is mixed with water in a ratio of 3:97 or 6:94 for use. It overcomes the weaknesses of conventional protein foam, such as poor fluidity, low resistance to oil contamination, slow extinguishing speed, inability to extinguish oil tank fires via sub-surface injection, and incompatibility with dry powder extinguishing agents. It is a new, highly efficient, and environmentally friendly green product free from malodorous substances like hydrogen sulfide and mercaptans.