Preparation methods of algal oil bio-asphalt and algal oil bio-asphalt mixture

The invention discloses a preparation method of algal oil bio-asphalt. The preparation method comprises the following steps: mixing algal oil with alcohol, performing esterification reaction, and performing reduced pressure distillation-condensation reaction on an esterification reaction product to obtain the algal oil bio-asphalt. The invention further discloses an algal oil bio-asphalt mixture and a preparation method thereof. The algal oil bio-asphalt mixture is prepared from the algal oil bio-asphalt and matrix asphalt by mixing in a weight ratio of 1:9-9:1 and high-speed shearing for 30-120 min. Algal oil is used for preparing the algal oil bio-asphalt, algae are cheap, widely sourced, green and renewable and can solve the problems of exhaustion, non-renewability and the like of resources such as petroleum, coal and the like; preparation processes of the algal oil bio-asphalt and the algal oil bio-asphalt mixture are simple and quick and are pollution-free to the environment, rawmaterials are simple and