The utility model provides a quick high accuracy testing lithium battery voltage, the device of internal resistance, the bottom fixed connection of support (2) is on base (1), locating piece (3) just can slide on the base with the base adaptation through the spout that sets up on the base about the battery, be provided with cylinder guide rail (4) on the support, cylinder (5) just can reciprocate on the support through cylinder guide rail and support looks adaptation, the bottom fixedly connected with activity groove (6) of cylinder, install anodal test needle (7) in movable groove, negative pole test needle (8), anodal test needle, the unsettled setting of lower extreme in movable groove is all run through to the bottom of negative pole test needle, set up foot switch on the base, foot switch and cylinder pass through the tube coupling. The device simple structure, when measuring lithium battery voltage, internal resistance, its test data is not influenced by the human factor, and pressure is invariable, and the data degree of accuracy is high, and convenient operation is nimble, can reduce intensity of labour.