The invention provides polyethylene glycol heterogeneous alcohol ester. The polyethylene glycol heterogeneous alcohol ester is characterized by being prepared from the following components in parts by weight: 100 parts of heterogeneous alcohol; 5 to 10 parts of hydrogen peroxide; 50 to 100 parts of polyethylene glycol. The polyethylene glycol heterogeneous alcohol ester has excellent lubricity, can be completely or partially replace the traditional anti-wear reagent at extreme pressure containing chlorine, sulphur and phosphorus through extreme pressure antiwear property, so as to be applied to a trace lubricant, a small amount of trace lubricant can meet the requirements on lubrication and cooling, wearing performance and extreme pressure and rust protection for metal processing, can save greater than 90 percent of the usage amount of a lubricant by being matched with trace lubricating device, and the polyethylene glycol heterogeneous alcohol ester can save energy and reduce emission, and has obvious environmental protection effect.