In paper manufacturing industry, pulp stirring is an important step in the whole technological process. The stirring effects of wood fiber and its mixture in agitator based on self-excited oscillation water jet were studied. Taking the wood fiber board as the erosion target, the crushed wood fiber board and slurry were put into the pulp stirring drum, the erosion and stirring effects of self-excited oscillation water jet on target material were analyzed. The results showed that when using the self-excited oscillation water jet to stir materials, the volume fraction of non fiber residues increased first and then decreased with the increase in the distance between the nozzle and the barrel level, and the stirring effects of jet improved with the increase in the jet pressure. The stirring effect of self-excited oscillation water jet was better than that of traditional mechanical agitation method under the same condition. The self-excited oscillation water jet had a greater pressure on target material compared with continuous water jet, and performed with high crushing efficiency and good stirring effect.