The invention discloses an electrical performance detecting method for the conductive leads of an LCD screen glass substrate; the method comprises the following steps: the conductive leads on the glass substrate of the LCD screen are divided into column driver leads and row driver leads corresponding to the column electrodes and row electrodes of a drive chip respectively; the column diver leads are stretched upwards the glass substrate, and the row driver leads are stretched towards both sides of the glass substrate; a liquid crystal box is made with an ordinary glass substrate and a glass substrate with the diver leads being stretched; and a detection device is used to input detection signals to the stretched column driver leads and row driver leads so as to get the testing result based on the feedback images from the liquid crystal box. The method enables the conductive leads of the LCD screen glass substrate to be completely stretched to appropriate locations according to needs, so as to achieve the electrical performance detection of all the conductive leads on the LCD screen glass substrate.