The invention relates to an icebound type pressure-maintaining and temperature-preserving sampler. The icebound type pressure-maintaining and temperature-preserving sampler comprises a drilling in / sampling switching mechanism, a refrigerating fluid circulating
system, a
slurry ice valve and core valve in-situ generation mechanism, a core accommodating
pipe single acting mechanism and channels I, II, III, IV, V and VI; the
slurry ice valve and the core valve which are generated by freezing are used to replace mechanical valves of a
ball valve or a plate valve and the like to close an upper port and an lower port of a sampling drilling tool,
solid impurities in a hole have no influence on the closing process, thereby the sampler has high reliability and solves the problems of difficult starting, difficult closing caused by easy blockage of sundries in the hole and the like of the tradition mechanical valves and improves pressure-maintaining reliability and success ratio; and moreover, radial dimension can be smaller so as to be beneficial to acquiring cores with larger diameters and improving
hydrate coring recovery factor. Tests prove that the ice valve can realize the sealing of 25MPa, which is suitable for drilling on
hydrate with an inner hole
liquid column reaching 2500m; and a hydro hammer drives a
reciprocating pump, which utilizes the
slurry as dynamic medium, thereby avoiding the complexity brought by an electric structure and having simplicity and reliability.