Laundry detergent with old bloodstain removing effect and preparation method thereof

The invention relates to the technical field of laundry detergents, in particular to a laundry detergent with an old bloodstain removing effect and a preparation method of the laundry detergent. 5 to 25 parts of a mixture; 1 to 15 parts of a nonionic surfactant, 0.3 to 10 parts of an ampholytic surfactant and 0.05 to 2.0 parts of a chelating agent; 0.05 to 1.0 part of a compound protease preparation; and 0.05 to 2.0 parts of CITRI-MET, 0.000025 to 0.005 part of (d)-limonene, and 0.000025 to 0.005 part of 0.05 to 0.5 part of a pH regulator; 0.05 to 0.5 part of a preservative; and 59 to 84.7545.995 to 93.499975 parts of deionized water is used as a raw material. According to the laundry detergent with the old bloodstain removing effect and the preparation method of the laundry detergent, the compound protease preparation aiming at Fe < 3 + > is prepared, amino acid residues in the compound protease preparation are combined with Fe < 3 + > to form strong coordinate bonds, the solubility of (d)-limonene of CITRI-