The invention provides a
fiber and a preparation method thereof, a
yarn and a fabric. The
fiber is of a
fiber structure formed by fusing and
spinning sponge fiber chinlon master batch, porous chinlon master batch,
moissanite chinlon master batch and chinlon master batch. Wherein the
sponge fiber chinlon master batch contains
calcium carbonate; the
moissanite chinlon master batch contains
silicon carbide; the
porous fiber master batch contains alkaline salt reaction substance crystals; wherein the fiber has a concave-
convex structure formed by
crystallization dissolution or
ablation of an alkaline salt reaction substance. The
fiber structure formed by fusing and
spinning the master batch has good
moisture absorption and air permeability, the comfort of the microenvironment on the surface of the close-fitting
skin of a user is maintained, and the material with cool feeling and air permeability is provided, so that the
moisture absorption and air permeability of the fabric are improved under the condition that the tissue structure is not changed; the stuffiness feeling felt by a user when the user wears underwear is reduced, and meanwhile in hot summer, a cool and refreshing wearing body feeling is brought to the user.