The utility model provides a synthesis gas detection device for a high-temperature and high-pressure environment. The synthesis gas detection device comprises a gas collector, a mist filter, a drainage cylinder, an
aspirator, an electronic condenser, an
electromagnetic valve, a gas tank, a flow meter, a
polymeric membrane filter and a
gas analyzer, the gas collector is connected with the mist filter, a connecting
pipe of the gas collector and the mist filter forms an angle of 20-30 degrees relative to the horizontal plane, the mist filter is connected with the drainage cylinder, the
aspirator is connected with the mist filter, the electronic condenser is connected with the
aspirator, the electronic condenser is connected with the
electromagnetic valve, and the
electromagnetic valve is connected with the gas collector. The electromagnetic valve is connected with the flow meter, and the flow meter is connected with the
polymeric membrane filter; a certain angle is formed between the gas collector and the mist filter, the high-pressure state of gas can be relieved, the
temperature and pressure of the gas can be adjusted through the mist filter, the drainage cylinder and the condenser, damage of synthesis gas to the
gas analyzer can be effectively reduced, the detection precision can be improved, and the service life can be prolonged.