A multi-stage rationed feeder for ornamental fish, comprising a container, a container cover assembly and a measuring cup assembly assembled in order from top to bottom, wherein the container is provided with an accommodating cavity for storing feed, and a first connection structure is provided at a periphery of a mouth of the container; the container cover assembly comprises a container cover and a falling-material receiving cover, wherein the container cover is provided with a second connection structure at an upper part periphery thereof, a material discharge hole at a lower part thereof, and a buckle bit slot at a lower-part outer cylindrical surface thereof, wherein a falling-material receiving hole is provided at a bottom surface of the falling-material receiving cover, a falling-material receiving cover pin is provided at a peripheral outside lateral face of the falling-material receiving cover, and a buckle position is provided at the peripheral internal face of the falling-material receiving cover; wherein the falling-material receiving cover is adapted to the container cover, and the buckle position is buckled into the container cover buckle bit slot, such that the falling-material receiving cover is rotatably mounted and connected to the container cover; wherein the second connection structure is adapted to the first connection structure, such that the container cover assembly is fixedly connected to the container from below; the measuring cup assembly comprises a measuring cup and a blocking slice, wherein an axial blocking slice pin is provided at a bottom center of the measuring cup, axial tooth slots are provided on a peripheral inner face of the measuring cup, a pin groove is provided on an outer edge of the measuring cup, and a separating plate is radially arranged with respect to a central axis; wherein one end of the blocking slice is provided with a sleeve hole for sheathing the blocking slice pin from the blocking slice, such that a quantitative loading zone is formed between the blocking slice and the separating plate; wherein the pin groove is adapted to the falling-material receiving cover pin, and the falling-material receiving cover pin is snapped into the pin groove such that the measuring cup assembly is removably mounted and connected to the container cover assembly from below; wherein, the container cover assembly further comprises a torsional spring; a lower part of the container cover is further arranged with two axial torsional spring clamping posts; a bottom of the falling-material receiving cover is arranged with an axial torsional spring sleeve post; the torsional spring sheathes the torsional spring sleeve post and is clamped between the two torsional spring clamping posts such that while the multi-stage rationed feeder is not feeding food, the azimuth bearing of the falling-material receiving cover is automatically located at where the material discharge hole is closed in the container cover assembly; wherein the blocking slice can be pulled up and turned as different rations, the end part of the blocking slice can be inserted into different tooth slots, so as to get different capacities in the quantitative loading zone, forming multi-stage rations, and the outside surface of the measuring cup can be engraved with capacities corresponding to each tooth slot.