The present invention provides poly vinyl alcohol polar foam. Water is used as foamer and plasticizer. According to weight, water is 15 portion to 55 portion, and poly vinyl alcohol is 45 portion to 85 portion. The material are dissolved for expansion, melted and processed for foaming. The melting and processing foaming comprises a melting and extruding continuous foaming method and a molding foaming method. The poly vinyl alcohol polar foam is a plate material, sheet material, membrane or bead or square block. The poly vinyl alcohol polar foam of the present invention can be added with crosslinker, molecular composite agent, processing aid, nucleating agent and functional additive. According to the weight portion, the crosslinker is 0 portion to 2 portion, the molecular composite agent 0 portion to 10 portion, the processing aid 0 portion to 10 portion, the nucleating agent 0 portion to 5 portion and the functional additive 0 portion to 30 portion. When the poly vinyl alcohol polar foam of the present invention is used as heavy metal particles, adsorption, filtration and separation material of organic pollutant, the poly vinyl alcohol polar foam has the characteristics of rapid adsorption, easy desorption and capacity of being repeatedly washed.