The invention discloses a secure ad-hoc network single-path routing data transmission method for the problem that ad-hoc network data security is not sufficiently ensured. A stable network is established; under the condition that a new node joins the network and certain node in an original network is broken down, malicious node detection is carried out on the network; and a reputation evaluation formula parameter is updated in real time, thereby achieving a purpose of accurately detecting a malicious parameter. If a malicious node is detected, the node is processed as a breakdown node, and the security of the network is ensured. Data is encrypted through adoption of a key table, and the encrypted data is sent. In the original network, optimum path selection is carried out through a routing path hop count minimization rule and a link busy and idle rule between a sending node and a destination node. After a path is selected, the encrypted data is decrypted according to a corresponding key in the key table, and the original data information is restored.