The present invention discloses a spice used for mosquito repellent detergent powder and a preparation method for the spice. The spice is characterized by being prepared from the following raw materials in parts by weight: 0.3-0.5 part of citronella oil, 0.3-0.5 part of artemisia argyi oil, 0.2-0.4 part of peppermint oil, 0.2-0.4 part of lemon oil, 0.3-0.5 part of ambrotone, 2-4 parts of honeysuckle, 2-4 parts of angelica dahurica, 1-2 parts of wild chrysanthemum flowers, 10-15 parts of beta-cyclodextrin, 1-2 parts of polysorbate-80, and 20-30 parts of a composite embedding agent. The spice used for mosquito repellent detergent powder disclosed by the invention is good in fragrance depositing performance, long in action time, not only has refresh and lasting fragrance, but also has bacteriostatic and mosquito-repellent effects and a high practical value.