The invention discloses a gas drainage multi-parameter measuring device which comprises a handle, a gas composition detecting loop and a gas flow pressure detecting loop. the gas composition detecting loop is composed of a gas inlet and a gas outlet in a main unit and corresponding pipelines. A sampling pump is serially arranged in the gas composition detecting loop and in the main unit, the handle is provided with a water filtration box in side, a gas outlet of the handle is connected with a corresponding pipeline in the main unit through a filter arranged at the gas inlet of the main unit. The gas drainage multi-parameter measuring device samples and detects gas composition detection and flow pressure, a plurality of kinds of gas composition sensors are arranged in the gas composition detecting loop for gas composition detection, and measurement of multiple content parameters of the sampled gas is realized; the water filter box and the filter are arranged in the gas composition detecting loop for two-stage water filtering, water filter effect is further improved, water is prevented from entering an instrument during measuring, and the problem that damage is caused to the instrument and affect measuring accuracy of the gas drainage multi-parameter measuring device is avoided.