The invention discloses a cradle device for babies. The cradle device comprises a panel, a swinging part and a cradle part, wherein the swinging part is in matched connection with the panel in a swinging manner, the cradle part is in matched connection with the swinging part, a first motor is arranged in the upper end of the front end surface of the panel, a coupling shaft is arranged underneath the front end surface of the panel, a power shaft is in operating connection with the first motor, a rack wheel is fixedly arranged on the power shaft, the coupling shaft is in operating matched connection with the swinging part, the swinging part comprises a cam part and a locking part, a rack part is arranged on the outer side of the cam part, the cam part is in meshed connection with the rack wheel through the rack part, sliding chutes are correspondingly arranged left and right in the locking part, and a sliding cavity is arranged in the locking part between the sliding chutes. The cradle device for babies is simple in structure, time-saving, labor-saving, convenient in installation, secure in locking and suitable for popularization and use.