Micro-quantitative liquid injection device adaptive to various injection tubes

The utility model discloses a micro quantitative liquid injection device adapted to various injection tubes, which comprises a push injection outer tube, one side of the push injection outer tube is provided with a crossover coupling, the inner side of the push injection outer tube is movably provided with a push injection rod in a penetrating manner, one side of the inner part of the push injection outer tube is fixedly provided with a nut, and the other side of the push injection outer tube is provided with a nut. And an inner bearing is movably arranged on one side of the nut in the pushing injection outer pipe, an outer bearing is arranged on one side of the inner bearing in the pushing injection outer pipe, and a pushing injection hand wheel is movably arranged at the end, away from the conversion connector, of the pushing injection outer pipe through the inner bearing and the outer bearing. The adapter is good in using effect, the adapter can be quickly replaced according to needs, and therefore the ada