The invention provides a preparation method for highland barley dissolving powders and belongs to the field of food processing. Specifically, the highland barley is carefully chosen, cleaned, dried in a dryer and crushed in a pulverizer to prepare highland barley powders. After that, 60-70 weight parts of highland barley powders and 30-40 weight parts of rice flours are mixed up in a feed mixer and puffed in a twin screw extruder. The puffed highland barley is put into a fluidized bed to be dried, extruded by a tablet press, cooled and packaged. Due to the adoption of the above method, the defect in the prior art that the highland barley is not easy to process and mold due to the existence of amylopectin and the low content of gluten in the highland barley can be overcome. Highland barley dissolving powders prepared through the above method are brewed in boiled water to form a crisp and delicious highland barley paste. Therefore, not only the quality and the nutrient of the highland barley are maintained, but also the highland barley dissolving powders are convenient to take. The highland barley dissolving powders are suitable for the mass consumer. Meanwhile, the method is simple in process, high in mechanized level, suitable for large-scale industrial production and wide in popularization value.