Modified cellulose fiber obtained through modification

The invention relates to a modified cellulose fiber obtained through modification and belongs to the technical field of textile dyeing. The modified cellulose fiber is obtained by modifying a cellulose fiber through cationic modification agents including a small molecular quaternary ammonium salt cationic modification agent and a high molecular quaternary ammonium salt cationic modification agent, and the Zeta electrode potential value of the modified cellulose fiber is 0-15 mV when the pH value is 6.5-8.5; the small molecular quaternary ammonium salt cationic modification agent is an epichlorohydrin matrix derivative of epoxy quaternary ammonium salt, and the high molecular quaternary ammonium salt cationic modification agent is cationic starch. According to the modified cellulose fiber, the two specific modification agents are adopted and have a synergistic effect, so that the modified cellulose fiber can be subjected to salt-free low-alkali dyeing in a subsequent dyeing process, the pollution can be alleviated, the cost can be reduced, the process can be simplified, the difficulty can be lowered, and the modification and subsequent dyeing effects are good; the process is suitable for large-scale industrialized production.