Foundation pit support monitoring device

The invention relates to a foundation pit supporting monitoring device which comprises a mounting bottom plate, a supporting assembly, a supporting driving assembly and a foundation pit deformation monitoring assembly, the supporting assembly comprises a supporting plate and a supporting inclined strut, and the end, mounted on the mounting bottom plate, of the supporting inclined strut is further provided with a locking assembly; the foundation pit deformation monitoring assembly comprises a contact mounting plate, a contact, a signal transmitter mounting plate and a signal transmitter, the signal transmitter is provided with a contact terminal corresponding to the contact, and a gap is reserved between the contact terminal and the corresponding contact; when the supporting inclined strut deforms, the contact terminal can make contact with the corresponding contact so that the corresponding signal transmitter can be powered on and send out an alarm signal. When the foundation pit supporting monitoring device