The invention relates to a terahertz spectral imaging data reconstruction method and device, equipment and a storage medium. The method comprises the following steps: scanning a target object according to a first space interval and a first time domain sampling period to obtain first terahertz spectrum data; scanning the target object according to the second space interval and the second time domain sampling period to obtain second terahertz spectrum data, wherein the first space interval is greater than the second space interval, and the first time domain sampling period is greater than the second time domain sampling period; and reconstructing the second terahertz spectrum data according to the first terahertz spectrum data by adopting a preset reconstruction method to obtain third terahertz spectrum data. By adopting the method, the scanning time can be effectively shortened and the data volume is reduced.