Abstract: A flame simulation apparatus includes: a housing having an assembly chamber; a support in the chamber, having a fixed shaft with two ends respectively fastened to an optical assembly and a swing assembly; an LED assembly in the chamber, having a light emitting surface facing the optical assembly; a projection assembly having one end fixed inside the chamber and the other opposing end provided outside the housing; and an electromagnetic assembly, held at a bottom of the chamber, for generating magnetic field when energized. The electromagnetic assembly operates with the swing assembly to drive the support and the optical assembly thereon to swing back and forth around the fixed shaft as a rotation center. Light emitted by the LED assembly is projected on the projection assembly through the swinging optical assembly. The apparatus may simulate burning flames, increase swinging reliability, prevent stuck phenomenon, and involve simple structures and easy assembling.