Microfluidic chip nucleic acid detection device

The utility model provides a microfluidic chip nucleic acid detection device, which relates to the technical field of nucleic acid detection and comprises a top plate, a bottom plate and a movable middle plate, a guide piece is arranged between the top plate and the bottom plate, and the middle plate is arranged on the guide piece. A test card and a valve driving assembly are arranged on the bottom plate, a biological chip, a PCR cavity, a piston cavity, a cracking cavity and a plurality of containing cavities are arranged on the test card, the biological chip, the cracking cavity and the containing cavities are all communicated with the piston cavity through flow channels, a piston is arranged in the piston cavity, and a valve is arranged in the valve driving assembly. The valve driving assembly is used for controlling opening and closing of valves in the flow channels; a displacement assembly used for driving the middle plate to move up and down is arranged on the top plate, a pistondriving assembly capable