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This invention discloses a method, system, and apparatus for differential pressure testing of industrial pipe fittings, relating to the field of industrial technology. The method includes: for each target test condition, adjusting the flow rate of the differential pressure testing system to the target flow rate value corresponding to the target test condition, adjusting the pressure to the corresponding target pressure value, and maintaining both the target flow rate value and the target pressure value within a preset fluctuation range; when the flow rate parameters and pressure parameters of the target test condition meet the preset stability judgment criteria, measuring and recording the differential pressure data of the industrial pipe fitting under test under the target test condition. By employing a closed-loop differential pressure testing system, the test medium achieves stable circulation within a closed loop. By setting multiple test conditions determined by target flow rate values ​​and target pressure values, and precisely adjusting the system flow rate and pressure to the target values ​​and maintaining them within the preset fluctuation range, the method meets the requirements for high-precision, multi-condition differential pressure performance testing of industrial pipe fittings.