Abstract: The present disclosure belongs to the technical field of food processing. Use of sucrose and maltose as binders in the existing energy bars leads to high hardness and adhering tooth in energy bars. Aiming at the problem, the present disclosure provides a preparation method of a low-sugar whole potato flour energy bar. Using starch gel and sugar alcohol as binders, whole potato flour and dried honey powder are added to prepare the energy bar; the starch is gelatinized, the sugar alcohol is dissolved, and gelatinized starch and a sugar alcohol solution are mixed in a mass ratio of 2:1 to 1:1 to prepare the binder; the binder is mixed with stir-fried whole potato flour and the dried honey powder, stirred evenly, and subjected to mold pressing or cool forming to obtain the energy bar.