We deeply explore the physical layer security of simultaneous wireless information and power transfer (SWIPT) network which uses the cooperative non-orthogonal multiple access (NOMA) technique in this paper. A novel cooperative NOMA strategy in which the near user with full-duplex ability is employed as a friendly relay by using SWIPT technology to harvest energy is proposed to enhance the capability of user far from base station (BS). Moreover, artificial-noise (AN) cooperation scheme is also proposed to improve the physical layer security while minimizing the base station transmitting power. To tackle nonconvex problem related to above cooperative NOMA strategy, we present a semidefinite-relaxation (SDR) and successive convex approximation (SCA) scheme. Numerical simulation results show that compared with other schemes, our scheme can significantly reduce the transmit power required by BS and improve the physical layer security of network.