The invention provides a preparing method for a
thuja-sutchuenensis hydrolat product. The preparing method includes the following steps that (1) aged
thuja sutchuenensis is cleaned and sliced, the obtained product is soaked for 16 hours to 24 hours with
distilled water of 4 fold to 10 fold to be subjected to reduced pressure
distillation, condensation is carried out, and oil-water mixed liquid isobtained; (2) the oil-water mixed liquid obtained in step (1) is subjected to standing and layering, and an
oil phase and a water phase are separated, wherein the
oil phase is huja-sutchuenensis
essential oil, and the water phase is a hydrolat crude product; (3) the hydrolat crude product obtained in step (2) is subjected to membrane separation and purification, and the
thuja-sutchuenensis hydrolat product is obtained, wherein in membrane separation, a
nanofiltration membrane is used for filtering, and products on the concentrated water side are collected; the
nanofiltration membrane of membrane separation is a
polyamide membrane, and pressure during membrane separation is 0.8 MPa to 1.2 MPa. The thuja-sutchuenensis hydrolat product obtained with the method comprises
cedrol ingredients inthuja-sutchuenensis
essential oil, also comprises
water soluble substances in a
plant, has the low-concentration characteristic, is good in permeability, is easily absorbed by the
skin, and can be directly used for a
skin care product.