The present invention provides a lip muscle strengthening device for preventing malocclusion and improving mouth breathing, comprising: an upper plate inserted into the mouth of a user to be positioned below the upper lip and having a first electrode formed on a bottom surface thereof; a lower plate inserted into the mouth of the user to be positioned above the lower lip and having a second electrode formed on an upper surface thereof; an outer support plate disposed in close contact with the outside of the user's lips and supporting the front end of the upper plate and the front end of the lower plate in a connected state, respectively, while separating the upper plate and the lower plate from each other; a pressure sensing part connected to the first electrode and the second electrode and allowing the user to recognize that the user's mouth is closed when the user presses the upper plate and the lower plate with the upper lip and the lower lip so that the first and second electrodes come into contact with each other. Accordingly, when the upper plate and the lower plate are disposed between the upper lip and the lower lip of the user's mouth and the user closes the mouth and pushes the upper plate and the lower plate with the upper lip and the lower lip, the first electrode and the second electrode are brought into contact with each other so as to recognize that the user's mouth is closed, thereby effectively enhancing the exercise effect of the lip muscles.
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