Cover-excavation deep foundation pit supporting system

The utility model relates to a cover and excavation deep foundation pit supporting system. The cover and excavation deep foundation pit supporting system comprises a fender post hanging net sprayed concrete supporting structure, a steel stand column supporting type reinforced concrete cover plate formwork supporting system, a fender post and steel enclosing purlin rapid connecting system, a cover plate lower steel support mounting and dismounting structure and a ground hanging reinforced concrete plate cutting system. The utility model has the beneficial effects that by adopting the fender post hanging net sprayed concrete supporting structure and the fender post and steel enclosing purlin quick connecting system, the operation is simple, local materials can be used, and the strength of the supporting structure is improved; according to the auxiliary device for accurate insertion of the steel stand column, the insertion accuracy of the steel stand column is guaranteed through the guide circular ring, and erro