The invention discloses a star-like oxazolidine latent curing agent and a preparation method as well as an application of the latent curing agent. The latent curing agent is characterized by being prepared by the following steps of: adding 0.01-0.1 part of sodium ethoxide, 5-60 parts of tetraethyl 1,1,5,5-pentane-terminated tetraformate and 15-120 parts of 2,2-dimethyl-N-hydroxyethyl-1,3-oxazolidine into a reaction kettle, uniformly mixing the above raw materials, under the protection of nitrogen, increasing the temperature to 105-115 DEG C, carrying out reflux reaction for 2.5-3.5h, after the fractionation of ethanol is finished, increasing the temperature of a reaction solution to 115-125 DEG C to fractionate residual 2,2-dimethyl-N-hydroxyethyl-1,3-oxazolidine, when the amount of 2,2-dimethyl-N-hydroxyethyl-1,3-oxazolidine is not changed any more, stopping heating, dropwise adding 10-50 parts of butanone solution of p-toluenesulfonic acid at the concentration of 20-40% while stirring, carrying out reaction for 25-35min, neutralizing the reaction solution using acid until the pH (Potential of Hydrogen) is 7-7.5, adding 0.05-0.1 part of calcium oxide into the neutralized reaction solution, continuing the reaction for 0.5-1.5h, carrying out hot filtration at 75 DEG C to obtain 6-80 parts of thick semisolid tetra-2,2-dimethyl-N-hydroxyethyl-1,3-oxazolidinyl 1,1,5,5-pentane-terminated tetraformate.