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The accuracy of droplet deposition position is one of the main factors affecting the morphology accuracy of spray forming devices. In order to control the droplet deposition position, a dynamic prediction model for droplet deposition position needs to be established. A model for the motion and heat transfer of micro droplets during the process of falling and deposition is established, and studies the changes in the centroid position of a single micro droplet and two adjacent micro droplets during the dynamic deposition process through numerical simulation and experiment. The results show that compared to the numerical simulation model, the theoretical prediction model established has a prediction error of 0.45% for a single micro deposition position, and a prediction error of 0.5% for the deposition distance between adjacent micro droplets, and comparative verification was conducted through experiments, indicating that the established theoretical model has sufficiently high position prediction accuracy, which can be used as a reference for online control of droplet deposition position and printing trajectory in the process of droplet spraying 3D printing.