The 3D shaping ruler uses high-precision 3D structured light depth camera technology to perform three-dimensional detection of human bone points within 30 seconds, accurately measure the user's body shape data, and use the innovative dual fusion algorithm to generate real human data models. Users can directly observe their own body models, and provide body shape analysis according to the algorithm to accurately monitor various body changes of the human body, such as humpback, round shoulders, leg shape, pelvis, and more than ten indicators. Users can use the 3D shaping ruler to record and track data and compare trends to help develop a healthy and scientific fitness shaping plan.