A diaper alarm device, comprising a casing, a circuit board (3) installed inside the casing, and a connecting mechanism used for detachably connecting a diaper sensor, the casing comprising a plate body (1) having an accommodating cavity (11), a main cover (2) having a downward concave arc surface (21) at one end, and an auxiliary cover (4) having a cambered surface (41) at one end, the mouth of the accommodating cavity (11) being arranged on one plate surface of the plate body (1), the main cover (2) and the auxiliary cover (4) being arranged side-by-side to the mouth of the accommodating cavity (11), such that the cambered surface (41) is in sliding contact with the concave arc surface (21), an inclined groove (42) being arranged on the bottom of the auxiliary cover (4), a metal shaft (5) being installed in the inclined groove (42), the two ends of the metal shaft (5) being pinned to the plate body or the circuit board (3) after being bent, such that the auxiliary cover (4) is restricted to the mouth of the accommodating cavity (11) and is only rotatable by means of external force； the connecting mechanism comprises connecting electrodes (31) arranged on the circuit board (3), and a plurality of short pins (43) arranged on the lower surface of the auxiliary cover (4), the connecting electrodes (31) being positioned below the auxiliary cover (4) and corresponding to the plurality of short pins (43). A diaper sensor can thus be conveniently, quickly, and reliably connected detachably to the diaper alarm device.L'invention porte sur un dispositif d'alarme de couche, comprenant un boîtier, une carte de circuit imprimé (3) installée à l'intérieur du boîtier, et un mécanisme de connexion utilisé pour connecter d'une manière amovible un capteur de couche, le boîtier comprenant un corps de plaque (1) comportant une cavité de réception (11), un couvercle principal (2) présentant une surface arquée concave vers le bas à une extrémité (21), et un couvercle auxiliaire (4) pré
