The invention discloses a water-woven net water-locking moisturizing cosmetic and a preparation method thereof. The water-woven net water-locking moisturizing cosmetic is prepared from, by weight, a phase A, a phase A1, a phase B, a phase C and a phase C1, wherein the phase A comprises water and hydroxyethyl urea, the phase A1 is prepared from glycerol, sodium hyaluronate with a weight-average molecular weight of 1000000-1300000 Daltons, sodium hyaluronate with a weight-average molecular weight of 5000 to 10000 Daltons and sodium hyaluronate with a weight-average molecular weight of 300000-600000 Daltons, the phase B comprises p-hydroxyacetophenone and a preservative, the phase C comprises a mixture of water, butanediol and a purslane extract, prebiotics, panthenol, ceramide, a water-locking magnet and fibronectin, and the C1 phase is prepared from water, tetrahydromethylpyrimidine carboxylic acid and an ajuga turkestanica extract. According to the invention, through mutual cooperation of an ajuga turkestanica extract, sodium hyaluronate with three different molecular structures, ceramide and a water-locking magnet, a skin water absorption channel can be opened, water can penetrate into a skin basal layer, intercellular space is filled, water molecules are linked, and a net-shaped water film is formed.