Ink path device of ink jet printing equipment

The invention relates to an ink path device of ink-jet printing equipment. A first ink box, a second pipeline (connected with a spray head), a second ink box, a circulating ink return pipeline and the first ink box form a small circulating ink path; the first ink box is in the positive pressure state, the second ink box is in the negative pressure state, ink in the first ink box is sufficiently supplied to the spray head for ink-jet printing work through cooperation, the ink-jet amount and flow are sufficient during ink-jet printing of the spray head, and the problem of printing line breakage is avoided; meanwhile, ink in the first ink box is kept stable in liquid level under the cooperation of the first liquid level sensor and the printing non-stop variable-frequency ink supply pump, ink consumed by printing work of the spray head is continuously supplemented, and the problems that bubbles are generated or the liquid level fluctuates due to the fact that ink stability is damaged by frequent starting are solv