The invention discloses a buried metal pipeline erosion resistant coating disbonding test system under the action of direct current stray current, comprising a direct current stray current system which is used for providing direct current stray current required by sample erosion resistant coating cathodic disbonding; an electrochemical test system which is used for testing the dynamic parameters of sample erosion resistant coating disbonding in the direct current cathodic polarization process and performing data processing and analysis; a soil simulated solution system which is used for simulating the actual working conditions of a buried metal pipeline in different soil environments; a sample clamping system which is used for clamping a sample of the buried metal pipeline needed by test;and an electrolytic tank system which is used for containing the soil simulated solution and fixing the sample clamping system. The system disclosed by the invention is simple in structure, convenientin dismounting, good in experiment test result, capable of effectively simulating pipeline erosion resistant coating cathodic disbonding caused by inflow of the stray current to the damaged points ofthe erosion resistant coating of the buried metal pipeline, and applicable to the experimental study of cathodic disbonding of the erosion resistant coatings of various buried pipelines.