The invention relates to the technical filed of ultra-abyssal-sea
multicellular organism fidelity sampling, and in particular to a bidirectional
piston type abyss
multicellular organism trapping and fidelity sampling device. The bidirectional
piston type abyss
multicellular organism trapping and fidelity sampling device comprises a bottom plate, wherein a sampling device, an
underwater decelerator, a
deep water motor, a control cabinet and an energy accumulator are uniformly distributed on the bottom plate; the sampling device comprises a pressure maintaining cylinder and a guiding cylinder which are connected through a
flange; two ends of the pressure maintaining cylinder are opened; a sampling
piston is arranged in the pressure maintaining cylinder, a cavity is formed in the sampling piston, a penetrated square opening is formed in the middle part of the sampling piston, and a sampling
pipe is arranged in the cavity; two ends of the guiding cylinder are opened; the front end of the guiding cylinder is connected with the pressure maintaining cylinder through the
flange, and the rear end of the guiding cylinder is connected with the connecting cylinder; the input end of the
underwater decelerator is connected with the
deep water motor; the energy accumulator is connected with the pressure maintaining cylinder through a capillary; and the control cabinet is connected with the
underwater decelerator and the
deep water motor through a watertight cable. Through the adoption of the bidirectional piston type abyss multicellular
organism trapping and fidelity sampling device disclosed by the invention, pressure maintaining sampling can be completed, so that the obtained biological samples are guaranteed to be fundamentally kept in the in-situ pressure, and the
survival rate oforganisms is greatly increased.