The invention relates to a water-based fluid preparation with moisturizing, 
skin protecting and mosquito expelling functions, belonging to the chemical field. The preparation comprises the following components in percentage by weight: 10.00-10.50% of 
DEET (N,N-diethyl-meta-toluamide), 15.00-20.00% of 
propylene glycol, 0.30-0.90% of hydrogenated 
castor oil, 65.05-71.40% of deionized water, 0.05-0.10% of methyl parahydroxybenzoate, 0.05-0.15% of propyl p-
hydroxybenzoate, 3.00-5.00% of 10:1 aloe juice and 0.20-0.30% of 
allantoin. In the invention, the traditional ethyl 
alcohol solvent is replaced with water, no odorous smell of the ethyl 
alcohol is produced when the preparation is used, the water is more applicable to the preparation compared with the ethyl 
alcohol from the aspect of volatility, and the effective mosquito expelling time is prolonged. Meanwhile, the 
allantoin and aloe juice have the 
skin protection function, thus the effects of moisturizing and protecting 
skin are achieved while mosquitoes are expelled for a 
consumer. The preparation can be taken as a mosquito expelling product in summer, and is more consistent with more environmental-friendlyrequirement, and the application is 
safer and more effective.