The utility model discloses a tool of lighting a lamp for testing display screen, include: the tool body of lighting a lamp, be fixed in light a lamp tool body one side and with light a lamp and have the spaced between the tool body and hold carrier, it has hollow out construction just to hold carrier hollow out construction first space of intercommunication and second space, wherein, first space is hold carrier and light a lamp space between the tool body, the second space is it keeps away from to hold carrier the space of one side of tool body lights a lamp. The utility model discloses a tool of lighting a lamp of test display screen is compared with prior art, has solved the relatively poor technical problem of accuracy of the current tool test of lighting a lamp.