A repair assembly for a screw head special for a radar stealthy combat aircraft comprises a wave-absorbing ring piece and a wave-absorbing groove core which are in clearance fit. The wave-absorbing groove core is arranged in the wave-absorbing ring piece in a penetrating-sleeved mode. The wave-absorbing ring piece is a circular-ring-shaped body. The upper end face of the wave-absorbing ring piece is a smooth plane. The lower end face of the wave-absorbing ring piece is a rough plane. The wave-absorbing groove core is a step column and comprises a groove core cap, an upper groove core body, a lower groove core body, a ventilation channel and a groove core rod. The center lines of the groove core cap, the upper groove core body, the lower groove core body and the groove core rod coincide on one straight line, and the groove core cap, the upper groove core body, the lower groove core body and the groove core rod are in series connection sequentially to form a whole. According to the repair assembly, the radar stealthy effect is prominent, reliability is high, operation is simple, installation is convenient, and the maintenance efficiency of the radar stealthy combat aircraft during combat is high.