The invention discloses a liquid-injection system for lithium battery liquid-injection and lithium battery liquid-injection equipment comprising the same. The liquid-injection system comprises a lithium battery liquid-injection rotating disc and a lithium battery liquid-injection device. A plurality of lithium battery liquid-injection jigs are arranged on the lithium battery liquid-injection rotating disc, and the lithium battery liquid-injection rotating disc drives the multiple lithium battery liquid-injection jigs to rotate and form an arc-shaped rotating track; the lithium battery liquid-injection device comprises a liquid-injection rotating driving part and a plurality of liquid-injection heads; the liquid-injection rotating driving part drives the multiple liquid-injection heads to rotate along the arc-shaped rotating track formed by the multiple lithium battery liquid-injection jigs; the lithium battery liquid-injection rotating disc drives the multiple lithium battery liquid-injection jigs to rotate only in the clockwise direction or in the anticlockwise direction; and the liquid-injection rotating driving part drives the multiple liquid-injection heads to rotate alternately back and forth in the clockwise direction and in the anticlockwise direction. According to the liquid-injection system, the property that the lithium battery liquid-injection rotating disc is rotatable is fully utilized, the influence of occupation of the liquid-injection time on other stations is reduced, the time is fully utilized, and the overall production efficiency is improved.