Method for preparing plastic from algae

The invention relates to a method for preparing plastic from algae. The method includes the concrete steps that 1, an algae raw material is cleaned preliminarily to remove impurities, dried, and put into a planetary ball mill to be ground and passes through a screen of 600-800 meshes; 2, screened algae powder, polyesteramide, maleic anhydride, styrene and benzoyl peroxide are added into organic solvent together and heated to 40 DEG C-80 DEG C to react for 5-10 h on the vacuumized and stirred conditions to obtain a pre-reaction liquid; 3, by weight, 3-6 parts of compatibilizers and 2-5 parts of lubricant are added into 50-70 parts of the pre-reaction liquid, and after being mixed uniformly, the mixture is extruded and granulated through a co-rotating twin screw extruder to obtain the product. Whole algae bodies can be adopted for preparation, the algae use ratio is greatly increased, the prepared plastic product has standard performance and is low in cost, and the process is simple and suitable for industrial production.