Sodium alginate is used as a main film-forming ingredient with different concentrations of cinnamon essential oils added to prepare edible antimicrobial films. The concentration of sodium alginate, glycerol concentration and cinnamon oils, dry temperature and time are determined according to mechanical properties and antibacterial properties of the film. The results show that film has the best mechanical properties and antibacterial properties when the concentration of sodium alginate is 20 mg/mL, glycerol is 1.0% and cinnamon oil is 2%, the best drying temperature and time is 50℃, 4.5h respectively.