The present invention is fast crop stalk ammoniating process with liquid ammonia for producing feed. The production process includes loading crushed or squashed into high pressure container, filling the tank with liquid nitrogen, applying high pressure to convert coarse fiber in stalk in short time and combining with protein nitrogen to produce ammoniated feed. The said process is simple, can well maintain the nutritious matters in stalk and raise coarse protein content and has short processing time, high production efficiency, low cost, high processing effect, reuse of recovered liquid ammonia, no pollution and other advantages.