A multi-stage rationed feeder for ornamental fish, comprising a container (1), a container cover assembly (2) and a measuring cup assembly (3). A first connection structure (12) is provided at the periphery of a mouth of the container (1). A falling-material receiving cover (23) of the container cover assembly (2) is adapted to a container cover (21), and a falling-material receiving cover buckle position (233) is buckled into a container cover snapping slot (211), such that the falling-material receiving cover (23) is rotatably mounted and connected to the container cover (21). The container cover assembly (2) is fixedly connected to the container (1) from below. The measuring cup assembly (3) comprises a measuring cup (32) and a blocking slice (31). One end of the blocking slice (31) is provided with a sleeve hole (311) for sheathing a blocking slice pin (323) such that a quantitative loading zone (A) is formed between the blocking slice (31) and a separating plate (322). A pin groove (324) is adapted to a falling-material receiving cover pin (232), and the falling-material receiving cover pin (232) is snapped into the pin groove (324) such that the measuring cup assembly (3) is removably mounted and connected to the container cover assembly (2) from below.