Deep foundation pit supporting equipment and construction method thereof

The invention relates to deep foundation pit supporting equipment and a construction method thereof, and relates to the technical field of foundation pit supporting, the deep foundation pit supporting equipment comprises a supporting device and a fixing device, the supporting device comprises a side supporting plate used for supporting the side wall of a deep foundation pit, a bottom supporting plate used for supporting the bottom wall of the deep foundation pit, and a supporting rod used for connecting the side supporting plate and the bottom supporting plate; one ends of the supporting rods are fixedly connected with the side supporting plates, and the other ends of the supporting rods are fixedly connected with the bottom supporting plate; the fixing device comprises a plurality of fixing nails used for being inserted into the inner wall of the deep foundation pit, and at least one fixing nail is arranged on the side supporting plate and the bottom supporting plate in a penetrating mode. The fixing nail is