The invention discloses a modular rapid construction method for a structure-beam steel bar skeleton of a deep foundation pit. The construction method comprises the steps of segment division of the structure-beam steel bar skeleton, prefabrication of the structure-beam steel bar skeleton, hoisting of the structure-beam steel bar skeleton, placing and rotating of the structure-beam steel bar skeleton and connecting of the structure-beam steel bar skeleton. According to the construction method, a three-dimensional real scene model is established by utilizing an BIM technology in combination withthe the actual position relationship of an enclosure structure of the deep foundation pit and a supporting system, the hoisting and assembling process of the structure-beam steel bar skeleton is simulated, segment division is reasonably carried out on the structure-beam steel bar skeleton, and smoothness of hoisting is ensured; and the structure-beam steel bar skeleton can be prefabricated in sections on the ground in advance through a prefabricated jig frame, the main line construction period is not occupied, and rapid construction of the structure-beam steel bar skeleton of the deep foundation pit is achieved. According to the construction method, the problem of slow construction progress of the structure beam in the limited space of the deep foundation pit is effectively solved. The construction method has the characteristics of simple operation, good safety and high work efficiency, and has good social and economic benefits.