The invention provides drilling fluid applicable to seabed natural gas hydrate storage and relates to the field of exploitation of natural gas hydrate. The drilling fluid provided by the invention isprepared from the following components: polyethylene glycol, sodium chloride, ethylene glycol, potassium chloride, potassium humate, xanthan gum, polyvinylpyrrolidone K90, propylene glycol monomethylether, polyvinyl methyl ether and preparation water; the drilling fluid can be used for carrying out seabed natural gas hydrate storage drilling and has solid-phase-free and low-temperature-resistingeffects; a kinetic inhibitor and a synergist are added into the drilling fluid and are compounded so that the drilling fluid has a relatively strong hydrate generation inhibition effect; the components of the drilling fluid have small dangers to environment and the drilling fluid has the advantages of high efficiency, environmental protection, low price and easiness for obtaining the raw materialsand the like.