An electric cradle mainly solves the problem that a traditional cradle shakes left and right, the difference between a left-right shaking mode and the mode that parents hold babies to make them fall asleep is large, and accordingly the babies cannot fall asleep as soon as possible. The electric cradle structurally comprises a swing mechanism and a linkage mechanism; the swing mechanism comprises a rotary wheel; a cam groove is formed in the end face of the rotary wheel, a swing arm bearing is arranged in the cam groove, the swing arm is provided with a big end and a small end, and the small end is provided with a shaft perpendicular to the end surface of a plate; the shaft of the small end is inserted into the swing arm bearing, a swing arm bearing block is welded to the large end, and a lug ring bearing is arranged in the swing arm bearing block. During work, a motor is controlled to rotate through an external switch, the motor rotates to drive the rotary wheel to rotate, and the rotary wheel rotates to drive the swing arm to move up and down; meanwhile, the rear part of the cradle is not fixed, and the electric cradle depends on contact between a pulley and the bottom of a shell, so that the actual movement track of the cradle is oval, and therefore the purpose that the babies fall asleep by simulating the shaking mode of the human body to make the babies fall asleep is achieved.