Algae residue degradation liquid, and preparation method and application of algae residue degradation liquid

The invention discloses an algae residue degradation liquid, and a preparation method and an application of the algae residue degradation liquid. The preparation method comprises the steps of acidolysing algae residue with concentrated acid, neutralizing to be neutral with calcium hydroxide, detoxifying, and obtaining the degradation liquid. According to the method, the microalgae residue is mainly degraded by a chemical means, so that an obtained acidolysis liquid has the capacity of generating alpha-pinene and isoprene through fermentation, and the method serves as a waste recycling method, so that low-cost raw fermentation material replacing glucose can be produced.