The invention discloses a hydraulic hybrid-power excavator system. The hydraulic hybrid-power excavator system mainly comprises a boom drive loop and an energy collecting and releasing loop and specifically comprises a first hydraulic variable pump, a second hydraulic variable pump, a third hydraulic variable pump, a main valve, a first oil cylinder, a second oil cylinder, a fan, a first hydraulic motor used for driving the fan to work, a fourth control valve, a fifth control valve, a sixth control valve, an energy accumulator, a safety valve, a seventh control valve and a second hydraulic motor used for driving the third hydraulic variable pump through an auxiliary engine, wherein the first oil cylinder is a bucket cylinder and is used for driving an excavator bucket device to carry out excavation work and unloading work, and the second oil cylinder is a boom cylinder and is used for driving an excavator boom to be lifted. According to the hydraulic hybrid-power excavator system, complex operation interference of the boom and a bucket is avoided when the potential energy of the boom is recycled, the maximum efficiency is realized when the recycled energy is released, the operability is good, and the transmission efficiency is high.