A PVA/P(AA-AM)/Urea composite superabsorbent resin with urea sustained-release function has been synthesized via aqueous solution polymerization using polyvinyl alcohol (PVA), acrylic acid (AA), acrylamide (AA) and urea as the raw materials, potassium persulfate (KPS) as initiator, and N, N’-methylene diacrylamide (MBA) as crosslinking agent. The resultant resin was characterized by FTIR, TG, DSC and SEM. Its properties such as water absorption ratio, water absorption rate and urea release have been measured. The effects of PVA dosage, AM dosage, urea dosage, KPS dosage, MBA dosage and AA neutralization degree on the water absorption ratio of the resin were studied through the single-factor experimental design. The results showed that when AA quality was 10.0g, and AA quality was taken as the benchmark, 10%AM, 15%PVA, 0.4%KPS, 0.05%MBA were added, urea quality was 10.0g, and AA neu-tralization degree was 70%, the synthetic water absorption resin water absorption rate reached 505g/g, saltwater absorption rate reached 88g/g; And the initial water absorption rate of the synthetic super ab-sorbent resin could reach 86.58g•min/g. Under the conditions of humidity of 10% and temperature of 25℃ and 40℃, water release ratio of the resin were 40.9% and 68.0% respectively. Urea in the resin could be sustainably released for 13d in distilled water, and the weak acidity and neutral environment are con-ducive to the sustained release of urea.