The invention provides a novel pyrethroid compound having the following structural formula (X), a preparation method of the compound and application thereof in sanitary desinsection products. In the formula, R is methoxymethyl (-CH2OCH3) or an H atom. Experiments show that the compound of the formula (X) has very good control efficiency on sanitary insect pests such as mosquito, fly, and blattella germanica, etc. In addition, the advantage which is especially worth being noticed is that the single optical isomer of the dextral cis form of the compound has better desinsection activity compared with corresponding despinner.