A method and a device of predicting reservoir sand bodies based on a wind field-provenance-basin system are provided. The method includes: acquiring geological data of a to-be-predicted area, which includes several of core data, paleontological data, well logging data and seismic data; inputting the geological data into a preset wind field-provenance-basin system model, for generating beach-bar-sand-body formation-process-data for the to-be-predicted area, where the wind field-provenance-basin system model includes several of a paleo-provenance restoration tool, a paleo-wind force restoration tool, a paleo-wind direction restoration tool, a paleo-geomorphology restoration tool and a paleo-water depth restoration tool; and predicting distribution locations where the beach-bar sand bodies are distributed in the to-be-predicted area using geological methods and geophysical methods based on the beach-bar-sand-body formation-process-data. The present disclosure enables efficient identification and prediction of the distribution locations and range of adlittoral thin beach bar-sand bodies, and improves the feasibility and accuracy of those ways of prediction reservoir sand bodies.