The invention discloses an energy efficiency testing method applied to an energy supply system in a combined cooling, heating and power supply area. A very accurate test result is obtained by calculating thermal operating parameters of main equipment, testing the energy efficiency, establishing a combined cooling, heating and power supply system performance evaluation model, testing various bottom data parameter indicators, and mutually integrating and verifying the various parameter indicators; the established combined cooling, heating and power supply system performance evaluation model can be applied to subsequent combined cooling, heating and power supply transmission and distribution equipment, system parameter testing method and energy efficiency judgment, and provides a standard. The energy efficiency testing method applied to the energy supply system in the combined cooling, heating and power supply area can be effectively applied in the field of energy efficiency tests of various energy supply systems in combined cooling, heating and power supply areas.