Internal detector performance testing device

The utility model discloses a performance testing device for an inner detector. The performance testing device comprises a ball serving cylinder, a ball receiving cylinder, a pump room water supply device, a compressor room gas supply device, a gas blow-down pipe section, a test water return pipe section, a different-multiplying-power elbow test pipe section and an anti-corrosion layer evaluation pipe section, according to the device, different circulation loops are switched between a water circulation loop and an air circulation loop by means of opening and closing cooperation of all valves according to different circulation media, an inner detector serves a ball in a ball serving cylinder, the passing performance of elbow detectors with different multiplying powers is simulated through a test connecting pipe section and elbow test pipe sections with different multiplying powers, and the testing efficiency of the elbow detectors with different multiplying powers is improved. The pipe section is evaluated thr