To improve the performances of the present Ping-Pong protocol systems over noisy channels, an efficient quantum secure direct communication scheme is proposed. Entanglement-assisted quantum low-density parity-check code is used to protect the encoded quantum information sequences against the channel noises, which improves the reliability of the quantum secure direct communication system. Furthermore, quantum automatic repeat-request protocol with error detection code is used to detect the strong channel noise effect, which improves the communication efficiency. Two steps of eavesdropping detection are taken to ensure the system security, and the iterative decoding performance of entanglement-assisted quantum low-density parity-check code is simulated over quantum depolarizing channel.