The invention provides a medical bedpan mechanism which comprises a bedpan (6), wherein the bedpan (6) is mounted on a bed body; the top of the bedpan (6) is covered by a bedpan cover (7); under the driving of a moving mechanism, the bedpan (6) is moved to a convenient position of a patient from a storing position of the bedpan; a baffle side (11) is arranged on the bedpan cover (7); a baffle plate (9) for baffling the baffle side (11) is arranged on the bed body; a first magnetic sucking module (8) is arranged on the bed body; a second magnetic sucking module (10) for sucking the first magnetic sucking module (8) is arranged on the bedpan cover (7); the bedpan cover (7) is further provided with a ring sleeve (12); and the bedpan (6) is further provided with a hook plate (13) hung with the sleeve ring (12) when the bedpan (6) is moved to the storing position. By adopting the medical bedpan mechanism, not only are automatic opening and closure of the bedpan cover (7) achieved, but also an automatic opening and closing structure is simplified, the cost is lowered, and the space occupied by the opening and closing mechanism is reduced.