The utility model discloses an asymmetric jar power pack of chamber independent control is held in open pump control load, including overflow valve A, motor, two -way variable displacement pump A, two -way variable displacement pump B, oil tank, overflow valve B and pneumatic cylinder, two -way variable displacement pump A, B's power stage do not be different, motor, two -way variable displacement pump A, the coaxial series connection of two -way variable displacement pump B, two -way variable displacement pump A's low pressure hydraulic fluid port and oil tank switch -on, two -way variable displacement pump A's high -pressure hydraulic fluid port is continuous with the no pole chamber of overflow valve A, pneumatic cylinder respectively, two -way variable displacement pump B's low pressure hydraulic fluid port and oil tank switch -on, two -way variable displacement pump B's high -pressure hydraulic fluid port link to each other with the pole chamber that has of overflow valve B, pneumatic cylinder respectively. The utility model discloses a two power stages do not different two -way variable displacement pump respectively with two chamber phase -matchs of executor, not only realized the matching of driving system with the load, reduced hydraulic system's power loss, and increased the controllable degree of freedom of system, improved the static characteristic that moves of system.