The ancient wooden wrecks and their stowage, which bear the history of human civilization and progress and have archaeological significance and value, have aroused much interest among archaeologists and historians, and their recovery is very important. Nevertheless, underwater active detection for buried wooden wrecks is similar to the search for a needle in a haystack, and hence no report has been seen up till now. Through a case study of wooden ship detection and validation, the authors confirmed that a high precision magnetic method is not only suitable for detecting a wooden wreck but also can verify the size and plane projection position of the wreck through the interpretation of magnetic anomaly caused by the wreck and thus excavate the valuable information. Practice shows that the magnetic prospecting technique can be used to detect the wooden wreck with reliability and effectiveness.