The invention discloses a beet alkaline plant growth regulator containing sorbic acid amide groups. The structure is shown as a general formula I. In the formula, X is selected from C1 or Br; M is selected from K, Na or NH4. A compound in the general formula I has excellent functions of promoting sprouting and rooting, increasing yield and improving quality, and can be widely applied to the yield increase or the survival rate increase of agriculture or forestry.