The invention discloses an electric adjusting support for an accelerator. The electric adjusting support comprises a base, adjusting plates, a lifting adjusting system and a horizontal adjusting system; the adjusting plates are fixed on the base and comprise a vertical moving plate and a horizontal moving plate which are stacked; the lifting adjusting system is arranged between the base and the vertical moving plate; and the horizontal adjusting system is positioned between the vertical moving plate and the horizontal moving plate and is used for controlling the horizontal moving plate to moveand rotate relative to the vertical moving plate in the horizontal direction. According to the electric adjusting support for the accelerator, the adjusting plates can be automatically lifted throughthe lifting adjusting system, the inclination angle of the adjusting plates can be adjusted by controlling worm elevators of the lifting adjusting system to be synchronous and asynchronous; horizontal transverse, longitudinal and rotational movement of the horizontal moving plate relative to the vertical moving plate can be achieved through the horizontal adjusting structure arranged between thevertical moving plate and the horizontal moving plate, so that the automatic control of the adjusting plates is realized, meanwhile, the number of layers of the adjusting plates is reduced, the horizontal adjusting system is simplified, the occupied space is small, and the support is miniaturized.