Micro-fluidic chip suitable for molecular diagnosis

The invention relates to the technical field of medical instruments, in particular to a micro-fluidic chip suitable for molecular diagnosis, comprising: a substrate comprising a sample cavity and a plurality of reagent tube cavities used for accommodating different reagent tubes; bottom puncture needles are arranged at the bottoms of the reagent tube cavities; the base body is provided with a piston assembly, the piston assembly comprises a piston cavity and a piston embedded in the piston cavity, and the buffer cavity communicates with the piston cavity; a puncture needle frame is installed above the base body, a top puncture needle is arranged on the puncture needle frame, an upper shell is installed above the puncture needle frame, a turncap is installed on the upper shell in a screwing mode, a front side sealing film and a rear side sealing film are bonded to the two sides of the base body, and an amplification cavity sealing film is bonded to the side face of the amplification cavity. After the chip is a