The invention discloses a heat-shielding structure of a steering engine. The structure is in a truncated inverted conical barrel shape, the top of the inverted conical barrel is defined as the front section, the bottom is defined as the back section, the inner circumferential surface of the inverted conical barrel is an outer isolating surface comprising a steel plate 1 and is used for separatingheat radiated to the steering engine 5 by flames ejected backwards by an exhaust nozzle 6, the outer circumferential surface is a connecting surface comprising an asbestos pad 2, the connecting surface extends from the back section to the front section to be in sealed connection with a projectile shell 4, the steering engine 5 and the exhaust nozzle 6 respectively, and the structure is placed in atruncated inverted conical barrel cavity, defined by the projectile shell 4, the steering engine 5, the exhaust nozzle 6 and an engine shell 7, at the tail of the engine. With the structure, branching and ejection of tail flames of the engine are facilitated, radiation of the tail flames of the engine, backflow heating and bottom environment pressure directly act on the heat-shielding structure,the structure is simple and reliable, and materials are cheap and easy to obtain.