Disclosed are a pressure coupling hydraulic hybrid power driving circuit and a control method therefor, and an excavator. The pressure coupling hydraulic hybrid power driving circuit comprises a three-way pressure matcher, wherein a first external oil port of the three-way pressure matcher is connected to a first oil port of an actuator element; a second oil port of the three-way pressure matcher and a second external oil port of the actuator element are connected to a hydraulic pump and an oil tank via control valves; and a third oil port of the three-way pressure matcher is connected to an oil port of an energy accumulator. The pressure and the flow at the oil port of the three-way pressure matcher meet the following pressure coupling relationships: (PA1±△P)q1＝P2•q2+PX•q3 and q1＝q2+q3. By adjusting P2 and q2, the function of the energy accumulator as an auxiliary power source cannot be lost due to the change in a load pressure PA1 of the actuator element, and the problems, in the prior art of hybrid power, that the pressure of a hydraulic pump, the load pressure of an actuator element and the hydraulic oil pressure of an energy accumulator are difficult to match, and that energy-saving operation thereof is difficult are thus solved.
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