Powder fuel scramjet engine mixing device

The invention discloses a mixing device of a powder fuel scramjet engine. The mixing device comprises an equal straight isolation section, a mixing combustion section and an expansion section which are sequentially and coaxially arranged in the incoming flow direction. The equal straight isolation section is connected with a powder feeding pipe, and the mixed combustion section is provided with an ignition piece; the blended combustion section, the expansion section and the equal-straight isolation section are equal in thickness, and an inner cavity of the blended combustion section is sunken outwards relative to inner cavities of the equal-straight isolation section and the expansion section in the width direction; the mixing combustion section is symmetrical relative to the axis in the width direction and is provided with a first inner wall face and a second inner wall face. A supporting plate is arranged in the mixing combustion section and located at the front end of the axis of the mixing combustion sect