The invention relates to a steam catapulting type organic matter garbage disposal machine with a discharge guide plate. The steam catapulting type organic matter garbage disposal machine comprises a steam pressure-keeping steel cylinder, a catapulting steel cage, a feed rotary cover and a catapulting initiation cylinder, wherein the catapulting steel cage is mounted in the steam pressure-keeping steel cylinder in a sliding manner, a steam inlet is formed in the steam pressure-keeping steel cylinder, a feed inlet is formed in the upper end of the catapulting steel cage, the lower end of the catapulting steel cage and a piston rod of the catapulting initiation cylinder are fixedly arranged, the feed rotary cover is mounted on the feed inlet of the catapulting steel cage, a discharge guide cylinder is mounted at the lower end of the steam pressure-keeping steel cylinder, the catapulting initiation cylinder penetrates through the discharge guide cylinder, guide discharge outlets are formed in two ends of the discharge guide cylinder, and the catapulting steel cage comprises an upper sliding disc, a lower sliding disc and a support column. The steam catapulting type organic matter garbage disposal machine provided by the invention has the advantages of simple structure, effect of being suitable for instantaneous catapulting, high pressure resistance, high strength, convenience in charging, uniform and ordered discharge during stream catapulting, and more smooth catapulting sliding.