Early shrinkage cracking is one of the important factors leading to the deterioration of concrete, the elongation and extension of cracks can be slowed down or even reduced by adding fibers. The objective of this article was to study the influence rules of regenerated cellulose fibers (RCFs) on the early cracking and the self-shrinkage of cement mortar under the sealed curing. The recycled cellulose fiber, UF500 cellulose fiber and non-absorbent polypropylene staple fiber were compared. The strength, the ratio of flexural strength to compressive strength and the self-shrinkage strains of cement mortar with fibers mixed at 1% or 2% by mass were analyzed. The results showed that the crack-resistance and self-shrinkage could not be improved by adding RCFs when the cement mortar at 0.3 water-cement ratio. When water-cement ratio was higher than 0.35, the ratio of flexural strength to compressive strength of mortar increased by adding 1% RCFs although it decreased the flexural strength and the compressive strength. Then under the quantity, the crack-resistance and shrinkage-reducing effect of cement mortar were enforced, too.