The invention discloses a preparation method of instant suaeda heteroptera and relates to the field of food processing. The method is characterized in that the instant suaeda heteroptera is prepared by the steps of picking and processing, bitterness removal, blanching, cooling, crispness keeping, cleaning, seasoning, metering and bagging, vacuum sealing, sterilization and cooling, finished product inspection, etc. In the invention, the processing flow and equipment of instant suaeda heteroptera are simple, the processing cost is low, the processing and utilization of suaeda heteroptera are promoted, and the economic value is raised; and meanwhile, the bitterness of suaeda heteroptera is removed during processing while the nutrition of suaeda heteroptera is maintained, and through combination seasoning, the suaeda heteroptera is sour-sweet and delicious and refreshing and appetizing. The pH value is adjusted by seasoning, the microbial growth is inhibited, the bright green color of suaeda heteroptera is kept, and the product has attractive color. The invention provides a new way for comprehensive processing and utilization of suaeda heteroptera as well as a new food option for consumers.