NOVELTY - A medical depilation spray comprises: phase A having macroviscosity white oil, silicone oil, emulsifying agent, alcohol, stearic acid, essence, methyl paraben and ethyl hydroxybenzoate; phase B having urea, sodium pyrosulfite, 60% potassium hydroxide solution (3-7), Carbopol 934 (RTM: cross-linked polyacrylate polymer), glycerol, propylene glycol and deionized water; phase C having trihydrate thiol calcium acetate and calcium hydroxide; phase D having e.g. triclosan orhyamine; phase E having e.g. menthol crystal and vitamin E; and phase F having e.g. n-butane.    USE - For skin preparation of an operation (claimed).    ADVANTAGE - The medical depilation spray is capable of replacing the prior traditional skin preparation technology and product; quickly, effectively, safely and rapidly performs unconventional traditional skin preparation to the patient; reduces the infection percentage of skin preparation part and operation incision greatly; and reduces the risk of operation.    DETAILED DESCRIPTION - A medical depilation spray comprises (g/ml): phase A including macroviscosity white oil (2-5), silicone oil (1-4), emulsifying agent (4-8), 16-18C alcohol (4-8), stearic acid (1-3), essence (0-0.4), methyl paraben (0.1-0.3) and ethyl hydroxybenzoate (0.5-1); phase B including urea (5-10), sodium pyrosulfite (0.2-0.4), 60% potassium hydroxide solution (3-7), Carbopol 934 (RTM: cross-linked polyacrylate polymer) (0.1-0.3), glycerol (3-7), propylene glycol (3-7) and deionized water (100); phase C including trihydrate thiol calcium acetate (6-15) and calcium hydroxide (0.8-1.5); phase D including triclosan orhyamine (0.1-3), natural bisabolol (0.2-0.4); phase E including menthol crystal (0.1-0.3), vitamin E (0.5-1.5) and aloes extracting solution (3-7); and phase F including n-butane, iso-butane and/or propane (7-10), compressed nitrogen (10-30), dimethyl ether (20-25) or fluoroalkane (7-15). INDEPENDENT CLAIMS are included for the following:    (1) a disposable medical depilation spray suit comprising the medical depilation spray (25-100 ml), a disposable glove and an antiseptic wipe; and    (2) preparing the depilation spray involving: heating the phase A and phase B to greater than or equal to 80 degrees C, then slowly adding the phase B into the phase A, stirring, homogenizing; adding phase C, phase D and phase E successively; quantitative packaging to an aluminum pot, vacuumizing, entering the phase F, and sealing.