The invention discloses a display module light-on test device and a display module light-on test method. The device is used for performing light-on test on a to-be-tested display module and comprises a memorizer, a peripheral circuit and a field programmable gate array chip, wherein a microprocessor and a display interface controller are integrated in the field programmable gate array chip; the microprocessor is used for outputting initialization information; the microprocessor is connected with the display interface controller; and the field programmable gate array chip is connected with the to-be-tested display module through the display interface controller to output the initialization information to the to-be-tested display module, so that the to-be-tested display module is subjected to initialization operation, processed picture data is output to the to-be-tested display module, and the to-be-tested display module is subjected to light-on test. By the method, a hardware part of the light-on test device can be simplified, the design of the peripheral circuit is reduced, the use amount of electronic components is reduced, the stability of the light-on device is improved and maintenance of research staff is facilitated.