The utility model discloses a hydraulic mechanical arm special for decoration garbage. The device comprises a vehicle body base, A rotating disc is fixedly connected to the vehicle body base. one endof a first mechanical arm is hinged to the rotating disc, the first mechanical arm is in a hollow cuboid shape, a telescopic hydraulic arm is installed in a cavity of the first mechanical arm, one endof the telescopic hydraulic arm extends out of the cavity of the first mechanical arm to form an extending end, and a gripper is hinged to the extending end; A driving device is further installed onthe first mechanical arm and used for driving the telescopic hydraulic arm to move relative to the first mechanical arm. When the construction waste or the household waste is collected, the hydraulicmechanical arm is adopted to replace manual direct contact with the waste, so that the construction waste or the household waste is civilized, sanitary and safe, meanwhile, the traditional manual waste collection cost is reduced, and the benefit is improved; The hydraulic mechanical arm is large in working range, the working state of the gripper can be monitored in real time in a video mode, and the working automation level and efficiency can be effectively improved.