Array substrate and VT test method thereof, display panel and display device

The embodiment of the invention discloses an array substrate and a VT test method thereof, a display panel and a display device. The array substrate comprises a plurality of pixel circuits arranged in an array, and each pixel circuit comprises a driving module, a first initialization module and a second initialization module; a plurality of test circuits, wherein each test circuit comprises a switch unit and a test signal line; in the test stage of the pixel circuit, the first control signal end controls the first initialization module to be switched on, the second control signal end controls the second initialization module to be switched on, the third control signal end controls the switch unit to be switched off, and the pixel circuit is tested according to the output current of the test signal line. According to the embodiment of the invention, the pixel circuit on the array substrate is detected before the light-emitting element is transferred to the array substrate, so that the waste of the light-emitti