The invention provides a withstand voltage testing device for a liquid crystal panel. The withstand voltage testing device for the liquid crystal panel comprises a support column, a lifting rod, a fixing arm, a hollow funnel, a liquid pipeline and a liquid tank, wherein the lifting rod is disposed on the support column, the hollow funnel is fixed on the lifting rod by the fixing arm, and the liquid crystal panel to be tested is placed at the bottom of the hollow funnel. Due to the hollow funnel composed of a plurality of funnels of different radii, the withstand voltage testing device injectsdifferent amounts of liquid into the hollow funnel along the liquid pipeline through the liquid tank can and adjusts the height of the lifting rod to achieve the test of different weights and different pressing areas, and also can realize test of different positions by adjusting the position of the support column, which makes the withstand voltage test for the liquid crystal panel more convenient,quickly and efficient.