Active pressure compensator for deep-sea sampling and pressure compensation method thereof

An active pressure compensator for deep-sea sampling, comprising a spring chamber, a cam piston pump connected to the spring chamber, and a circuit chamber connected to the cam piston pump, wherein:

• the spring chamber is configured to provide liquid with a pressure higher than an environmental pressure by at least 0.5 MPa for the cam piston pump;
• the cam piston pump is configured to be capable of inhaling the liquid from the spring chamber and pumping out the liquid to the circuit chamber;
• the circuit chamber is configured to be connected to a mechanism to be pressurized and is provided therein with a pressure sensor and a control circuit board connected in communication with the pressure sensor, the pressure sensor is configured to detect pressures of liquid output by the cam piston pump and of the mechanism to be pressurized, the control circuit board is configured to send a control instruction to control working of the cam piston pump based on pressure data feedback from the pressure sensor and thereby realize active pressure compensation for the mechanism to be pressurized.