Quick connecting device for steel bar truss and bottom plate

The invention discloses a quick connecting device for a steel bar truss and a bottom plate, the quick connecting device comprises a supporting plate, a fixing hole is formed in the center of the supporting plate, a rotary fastening device is arranged in the fixing hole, the rotary fastening device comprises a rotator and a fastener, the fastener is connected with the steel bar truss, a shell of the rotator is fixed in the supporting plate, and the fastener is fixed in the supporting plate. A rotating shaft is arranged in the rotator and sleeved with a first reset spring, the rotating shaft is rotated after the first reset spring is compressed through the rotating shaft, and the top of the rotating shaft is connected with the steel bar truss through a fastener. The steel bar truss connecting piece has the advantages that the fastening device is rotated to be inserted into the fixing hole of the supporting plate, the steel bar truss and the bottom plate are rapidly connected through the fastener and the rotator