he invention belongs to the technical field of lubricating grease preparation, and provides a composite sodium-urea lubricating grease and a preparation method thereof. The invention adopts common industrial raw materials and a simple preparation method, and the composite sodium-urea lubricating grease is prepared by introducing sodium carboxylate into polyurea molecule. The composite sodium-urea lubricating grease has the advantages of favorable adhesiveness, extreme-pressure abrasion resistance, and especially long bearing life at high temperature. On the premise of having excellent properties, the invention controls the production cost, widens the application range of the polyurea lubricating grease, has a simple preparation technique, and has high popularization and application values.