Device for automatically binding reinforcing steel bars

The utility model discloses a device for automatically binding reinforcing steel bars. The device comprises a binding wire bin and a handle, a storage cavity is formed in the binding wire bin, a limiting device is arranged on one side in the storage cavity, a winding roller is connected to the limiting device, a guide hole is formed in the side, away from the limiting device, of the binding wire bin, a small air cylinder is arranged on the outer side, close to the guide hole, of the binding wire bin, and a piston rod is arranged at the top of the small air cylinder. According to the utility model, the telescopic seat is inserted into the bottom of the handle; the telescopic seat is provided with a limiting block and a limiting groove; the telescopic seat can move on the handle in the vertical direction; a spring is arranged at the bottom of a limiting block of a limiting groove, so that the telescopic base can be supported, meanwhile, a pressing block is arranged on the back of the handle, the pressing block