The invention relates to a production process method of an algae beverage. The production process method comprises the steps of material selection and arrangement, immersing, washing, crushing, deodorization, enzyme decomposition, fermentation, alcohol removal, clarification, filtration, acid-sugar blending, essence accessories addition, water addition for homogenizing, sterilization and canning. The production steps are carried out according to a certain sequence, the conditions of a production process flow are strictly controlled, and the production parameters of each step in the flow are monitored to obtain a high-quality algae beverage. The whole production process method is simple and clear in step, and provides good guarantee for production of the algae beverage which is healthy, environment-friendly, safe, reliable and good in color, aroma and taste. Meanwhile, algae raw materials are high in yield, the economic production cost is reduced, and the economic benefit is high on the premise of ensuring the quality of the beverage.