Pressure-maintaining sealed sampler for shale gas and core

The invention discloses a pressure-maintaining sealed sampler for shale gas and core, comprising a fishing mechanism, a spring positioning mechanism, a hanging single-acting mechanism, an in-place informing mechanism, an upper sealing mechanism, a core barrel, a core breaking mechanism and a lower sealing mechanism which are arranged in sequence together. The process from putting the pressure-maintaining sealed sampler into a shaft before drilling to taking out the core is as follows: putting in place, informing, sealing the upper end, breaking the core, sealing the lower end and fishing. The pressure-maintaining sealed sampler for shale gas and core has the advantages of low cost, a sealing function, simplicity in operation and high success rate, can expel gas originally exiting in the core barrel to reduce interference to the components of shale gas, and adopts a wire line coring mode; the core barrel has a flowing passage for drilling fluid when the sampler is put in, and the sampler can alarm after being