Underground device for testing gas-water production profile of coal bed gas commingling production well

The invention discloses a coal bed gas commingling production well gas-water production profile testing underground device. The device comprises a center pipe, an oil pipe, a liquid backflow assembly, a plurality of electronic switch valves and a packing piece. And the packer is used for isolating gas and liquid between the two production layers. After the electronic switch valve is opened, water produced by a production layer enters the oil pipe through the electronic switch valve to flow downwards, and is discharged to the ground along the central pipe through power provided by the liquid backflow assembly; gas produced by a production layer enters the oil pipe through the electronic switch valve, moves upwards and then is discharged out of the ground, so that gas-liquid separation is realized, and the measurement precision is improved. In the testing process, continuous measurement of different production layers can be achieved without moving the tubular column through minor repair operation, reservoir dam