The utility model relates to a micro-pressure rapid detection device. The micro-pressure rapid detection device comprises a sealing body consisting of a conduit, a sealing rubber ring and a rubber plug, one end of the guide pipe sequentially penetrates through a hole in the center axis of the rubber plug and the sealing rubber ring, a pressure guide pipe is arranged at the other end of the guide pipe, one end of the pressure guide pipe is connected with the sealing body through the guide pipe, and a U-shaped differential pressure gauge is arranged at the other end of the pressure guide pipe. And the micro-pressure rapid detection device is connected with the sampling port through the sealing body. A flange structure is used for linear pressing and sealing, pressure is led to an integratedU-shaped differential pressure gauge through a pressure leading pipe for pressure indication, and then a measured real-time pressure value is calculated according to local air pressure. The device hasthe advantages of simple structure, convenience in operation, easiness in maintenance, accuracy in measurement, long service life and low investment.