Disclosed is a magnetic surface fast wave photodiode with a magneto-optical thin film, comprising an optical input port (1), an optical output port (2), a magneto-optical thin film (3), a background medium (4) and a bias magnetic field. The magneto-optical thin film (3) is arranged in the background medium (4). The magneto-optical thin film (3) uses a magneto-optical material. The photodiode is composed of the magneto-optical thin film (3) and the background medium (4). The left end of the photodiode is an optical input end, and the right end thereof is an optical output end. The surfaces of the magneto-optical thin film (3) and the background medium (4) are provided with magnetic surface fast waves. The bias magnetic field is arranged at the magneto-optical thin film (3). The photodiode has a simple structure, has a high optical transmission efficiency, is small in size, is convenient to integrate, is applicable to large-scale optical path integration, and has broad application prospects.
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