The disclosure provides a non-ionic water based polyurethane, which is prepared from the following components in parts by weight: 120-185 parts of polymeric polyol, 30-40 parts of diisocyanate, 0.3-0.6 parts of antioxidant, 0.1-0.5 parts of organometallic catalyst, 1-3 parts of intramolecular crosslinking agent, 4-6 parts of silicone oil, 2.1-5.5 parts of auxiliary, 1-2 parts of chain extender, and 600-750 parts of water, where the polymeric polyol includes a polyether diol and a polyester diol, and the auxiliary includes a wetting agent, a leveling agent and a defoamer. The non-ionic water based polyurethane provided by the disclosure has excellent water resistance, mechanical properties and compatibility. Moreover, no organic solvent is added, thus, the disclosure results in no secondary pollution, and ensures environmental protection.