The invention discloses a plasma pyrolysis gas solubility measuring system and method, and solves the problems of the prior art that the equipment is complicated, the operation is tedious and the result is not accurate enough. The measuring system comprises a glass kettle, a vacuumizing tube, a vacuum pump, a needle, a high-pressure gas tube, a thermostatic waterbath pot, a gas cylinder and electronic scales; the needle and the gas cylinder are connected through the high-pressure gas tube; the glass kettle is arranged in the thermostatic waterbath pot; the two ends of the vacuumizing tube areconnected with the top of the neck of the glass kettle and the vacuum pump respectively; a cock valve is arranged on the neck of the glass kettle; a sealed sample inlet is formed on one side of the upper part of the glass kettle body; a thermometer is arranged on the other side of the upper part of the glass kettle body and is in sleeve joint with a blind hole channel; the gas cylinder charges a high-pressure plasma pyrolysis gas into the glass kettle body by inserting the needle into the sample inlet. The measuring method disclosed by the invention is implemented by using the measuring system. The measuring system and the measuring method disclosed by the invention have the advantages of simple structure and scientific design, and can be used for effectively measuring solubility, in various solvents, of acetylene and other gases in the plasma pyrolysis gas.