The invention relates to an adjustable micro-floating power assembly for a formula car. The adjustable micro-floating power assembly comprises a left half shaft, a right half shaft, a left stand column and a right stand column, wherein the left half shaft and the right half shaft are provided with a left tensioning frame and a right tensioning frame respectively, the left tensioning frame and the right tensioning frame are connected through a connecting rod and are correspondingly and rotationally connected with the left half shaft and the right half shaft, an upper connecting arm and a lower connecting arm are arranged on the left tensioning frame and the right tensioning frame, the lower connecting arm is rotationally connected with a frame, the upper connecting arm is rotationally connected with a tensioner, the tensioner comprises an upper connecting block and a lower connecting block which are connected through a bolt, and a U-shaped elastic tensioning block is arranged between the upper connecting block and the lower connecting block. The adjustable micro-floating power assembly has the characteristics of stable structure, capability of conveniently performing manual adjustment and micro-floating capability.