The invention discloses a wireless sensor network group key management method. The wireless sensor network group key management method is characterized in that according to individual secret information h(i) and a peer group key management node GKC (group key controller), broadcasting the following information Betaj=(Omega1(x)+Omega2(x), L, Omegaj-2(x)+Omegaj-1(x), Omegaj(x)) Upsilon(Beta1(x)+ Beta2(x), L, Betaj-2(x)+Betaj-1(x), Betaj(x)) to nodes in the group, so that the nodes calculate an add Alphaj according to the specific formula, and a novel session key Kj is acquired. Compared with the prior art, the wireless sensor network group key management method has the advantages that according to the polynomial and confusion value, self-healing effect is achieved, forward, backward and two-way secrecy of group communication is realized, and less communication and storage energy is consumed.