A dynamic flame simulating device mainly comprises an upper base, a flame element suspended from the upper base, a light source providing light rays, and a driving assembly below the flame element. The driving assembly further comprises an electromagnetic coil and a second magnetic element, wherein the electromagnetic coil is powered on to drive the second magnetic element to bounce toward a first magnetic element on the bottom end of the flame element to generate repellent magnetic acting forces to make the flame element swing naturally and achieve the dynamic visual effect of the natural beating of the burning flame.