Automatic picking device of mechanical arm

The utility model relates to the technical field of mechanical arms, in particular to a mechanical arm automatic picking device which comprises a supporting table and a mechanical arm body installed on the supporting table, a picking mechanism is arranged on the mechanical arm body and comprises a fixing block, a plurality of fixing frames are fixedly installed on the fixing block, a supporting block is arranged at one end of each fixing frame, and the supporting block is connected with the mechanical arm body. A vacuum air pump is fixedly installed on one side of the supporting block, a fixing rod is arranged below the supporting block, a suction nozzle body is installed at the bottom of the fixing rod, a conveying hose is connected between the vacuum air pump and the suction nozzle body, a screw rod rotationally connected through threads is arranged on the supporting block, and one end of the screw rod is movably connected with the fixing rod. According to the suction nozzle, through the arrangement of the