The invention discloses a foam fire extinguishing agent with a high-efficiency environment-friendly evaporation-inhibiting function. The foam fire extinguishing agent is characterized by comprising the following components in percentages by weight: 1% to 6% of an evaporation inhibiting agent, 1% to 6% of a fluorocarbon surfactant, 4% to 16% of a hydrocarbon surfactant, 2% to 6% of a polymer thickening foam stabilizer, 4% to 10% of a cosolvent, 4% to 10% of a pour point depressant, 0.1% to 0.5% of a preservative, and the balance of water. According to the foam fire extinguishing agent capable of inhibiting the volatilization of fuel and having the high-efficiency environment-friendly evaporation-inhibiting function, the coverage inhibition performance of the fire extinguishing agent can beimproved, and when foam is sprayed onto an oil surface, a dense multiphase composite film is formed at the oil interface, so that the volatilization of flammable liquids and oil can be effectively prevented, and fire is prevented from having re-combustion.