The invention provides apricot fruit fibers and a preparation method thereof. The preparation method comprises the steps of (1) primary drying; (2) rinsing; (3) secondary drying; (4) smashing; (5) extraction of water-soluble dietary fibers by adding a citric acid aqueous solution; (6) filtering; (7) extraction of filter residues through water once; (8) filtering; (9) filtering of the residues: a, decoloring, b, impurity removal, c, drying, d, function activation, e, smashing, f, obtaining of water-insoluble dietary fibers, g, combination of the two filtrates, h, centrifugation, i, concentration, j, clarification, k, vacuum drying, l, smashing activation, and m, obtaining of water-soluble dietary fibers. The application of apricot fruit residues is actually comprehensive utilization of agricultural byproducts; therefore, the industrial chain is prolonged, an additional value of an agricultural product is increased, and the utilization rate of apricot resources is improved.