In order to understand the dynamic mechanical properties of DNAN-based high solid content melt-cast explosive (20% DNAN/15% HMX/32.5% NTO/31% Al/1.5% functional additives, solid content 78.5%), the dynamic mechanical properties were analyzed. The stress-strain curves of DNAN-based melt-cast explosive samples under quasi-static and dynamic loading conditions were obtained by using universal material testing machine and split Hopkinson pressure bar (SHPB). The Maxwell model parameters of explosive were calibrated, and the model and calibration parameters were verified by numerical simulation. The results show that the failure strain of DNAN-based melt-cast explosive is less than 1.6 %, and the brittleness of DNAN-based melt-cast explosive is high. With the increase of loading strain rate, the failure stress increases, and the mechanical response is related to strain rate. The Maxwell model calibration parameters are accurate, and can better reflect the mechanical properties of explosives under different strain rates.