A drug carrier and a manufacturing method thereof are provided. The drug carrier includes a hydrophilic group, a hydrophobic group and an organic dye. The hydrophilic group and the hydrophobic group are connected by the organic dye. A plurality of the drug carriers are self-assemblable in a polar solvent to form a nanomicelle. The hydrophilic groups are located at the outer region of the nanomicelle, and the hydrophobic groups are located at the inner region of the nanomicelle.