High temperature resistant foaming water bridge crosslinked polyethylene plastics are divided into A and B materials. A material is low density polyethylene as the main raw material. The graft material is made by modified grafting. The foaming process is completed with crosslinking catalyst, nucleating agent, foaming agent and other additives in different production equipment. Foamed products are suitable for use at high temperatures. The cell does not shrink and deform. They can be widely used in occasions requiring heat preservation, sound absorption and seismic resistance. Non-toxic and tasteless materials can be used in food packaging. It can also be used for sound absorption, heat insulation and heat preservation in places with harsh environmental conditions, such as oil, acid, alkali, temperature and humidity.