The invention discloses a full-automatic powder forming hydraulic machine which comprises a forming oil press, a PLC and an automatic feeding assembly. The forming oil press comprises a lower-end fixed installation plate, an upper-end fixed installation plate, a movable installation plate and a forming driving oil cylinder. An upper die part comprises an upper die seat cushion plate, an upper die cushion plate and a forming upper die. A lower die part comprises a lower die installation seat, a lower die installation plate and a forming lower die. A die cavity body is embedded in a cavity plate installation hole of a movable cavity plate. A forming cavity is formed in the die cavity body. A floating lower die part comprises a first floating oil cylinder, a first floating installation plate and a floating lower die, and a fixed core rod is arranged on the lower-end fixed installation plate. The lower end side of the lower-end fixed installation plate is provided with an oil cylinder fixing plate, a lower-end supporting pillar, a second floating installation plate, a second floating oil cylinder and a floating connecting rod. By means of the above structural design, the full-automatic powder forming hydraulic machine can be used for automatically and effectively completing powder forming machining, and the full-automatic powder forming hydraulic machine has the beneficial effects of being novel in design, high in automation degree and high in work efficiency.