The invention discloses a preparation method of a puffed avicennia-marina food. The preparation method of the puffed avicennia-marina food comprises the following steps: (1), carrying out pretreatments; (2), preparing a main material, namely putting avicennia marina powder, an okra extract, onions and celery into a grinder, carrying out stirring at a rate of 1000-2000r/min so as to carry out pulping treatment for 18-30 minutes, adding minced meat, Chinese sorghum flour, bean curd residues and buckwheat flour, and carrying out uniform stirring so as to obtain the main material; (3), preparing a mixed material, namely adding seasonings into the main material, carrying out uniform stirring, carrying out treatment in a high-voltage pulsed electric field treatment room in the presence of 40 pulses of which the pulse intensity is 1200V/cm for 100 microseconds, and then, carrying out drying in an infrared drying chamber until the water content is 25-30% so as to obtain the mixed material; and (4), carrying out puffing treatment. The puffed avicennia-marina food prepared according to the preparation method can be used as a snack between meals for patients with hyperglycaemia/diabetes so as to control and stabilize blood glucose as an auxiliary means.