The invention belongs to the technical field of ferrous metallurgy and particularly relates to a gas-based and coal-based combined iron direct reduction method. By combining various advantages and disadvantages of a gas-based and coal-based iron direct reduction production technology, the gas-based and coal-based combined composite-type direct reduction method is obtained, the cost of a DRI product is reduced, so that the cost approximates to the production cost of a coal-based DRI product, and the DRI product with the quality equal to that of gas-based reduced iron can be obtained. The reduction temperature is low, the reduction speed is high, the reduction rate eta Fe is larger than or equal to 93% and can even reach up to 99%.