The invention relate to a reverse-normal combined construction method for a deep foundation pit. The reverse-normal combined construction method for the deep foundation pit comprises the steps that S1, an enclosing structure of the deep foundation pit is constructed; S2, the deep foundation pit is constructed through the reverse construction method to the position, without pipelines, outside the enclosing structure, then earth is excavated downwards layer by layer, every time a certain layer is excavated, a horizontal structure of the layer is constructed at the bottom of the layer, an earth outlet is reserved in the horizontal structure, and the horizontal structure of the layer is fixedly connected with the enclosing structure; S3, the deep foundation pit is constructed through the normal construction method from the position, without pipelines, outside the enclosing structure till the bottom of the deep foundation pit reaches the designed elevation, earth is excavated downwards layer by layer, and an anchor rod is arranged inside the enclosing structure every time one layer is excavated; S4, a bottom plate is constructed at the bottom of the deep foundation pit; and S5, the horizontal structures of all layers are constructed in sequence from the bottom plate upwards to the position, without pipelines, of the enclosing structure, and meanwhile, ground building structures aresequentially constructed upwards on the first layer of horizontal structure in the deep foundation pit. By adoption of the reverse-normal combined construction method for the deep foundation pit, theproblem that anchor rods cannot be constructed is solved, and the efficiency is high.