The invention discloses a three-layer combined tunneling construction method for a chamber of an extra-large elevator. The overall chamber is divided into an upper layer, an intermediate layer and a lower layer in the vertical height direction for constructing. The method comprises the following steps: firstly, constructing the lower layer by a central heading method; then, constructing a vertical patio of the intermediate layer; then, constructing the upper layer; finally, tunneling the intermediate layer. The roof caving danger caused by over-high roof control of the bottom and the top is reduced; the brushing and the expanding are performed on a middle part under the protection of a top plate pouring layer of an upper elevator; the safety coefficient of tunneling is greatly is improved; moreover, the construction efficiency is also improved. The roof control height is effectively controlled; the mechanical quick slag discharge is also realized.