The invention belongs to the technical field of iron and steel metallurgy and provides an electric arc furnace steelmaking beam concentration oxygen supply method using heat-value-variable fuel gas. An electric arc furnace beam concentration jet oxygen gun uses the heat-value-variable fuel gas; the fuel gas heat value and flow are dynamically adjusted in the blowing process, and the input intensity of heat in a furnace and the length of a beam concentration jet fire sleeve are dynamically controlled; the heat release amount of the fuel gas and a combustion position are independently adjusted; and an oxygen supply control system selects the work modes of the oxygen gun according to the actual requirements in different smelting stages, and the work modes of the oxygen gun include a combustion nozzle mode A, a combustion nozzle mode B, a combustion nozzle mode C, a dephosphorization mode, a decarbonization mode A, a decarbonization mode B and a protecting mode. The electric arc furnace steelmaking beam concentration oxygen supply method using the heat-value-variable fuel gas has the beneficial effects that compared with a traditional electric arc furnace steelmaking process, the melting time of waste steel is shortened by 1.5 min or above, the final slag FeO is reduced by 2% or above, the oxygen utilizing rate is increased by 3%, consumption of the high-heat-value fuel gas is reduced by 25% or above, the service life of the oxygen gun is prolonged by 30 furnaces or above, the comprehensive smelting cost is reduced by 3.5 yuan/ton of steel, economic benefits are good, and application prospects are wide.