Introduction: Lately, the use of natural cosmetics can have a good effect on the skin. One of them is traditional beauty treatments. The Serum is a preparation with low viscosity, because of its low viscosity serum is categorized as an emulsion preparation. From the results of research that has been carried out, ethanol extract of Hati Tanah tuber has great potential as an anti-acne because it can inhibit the growth of acne-causing bacteria such as Staphylococcus aureus, Staphylococcus epidermidis, Propionibacterium acnes. With the innovation of serum ethanol extract of Hati Tanah tuber, it can be an option for the community later in the treatment of acne. Methods: The formulation is made in 4 (four) formulas with different concentrations of the main ingredients used. Next is to weigh all the ingredients needed according to each formula. Then physical properties test performed. a) Organoleptic test; b) Homogeneity Test; c) pH test; d) Spreadability Test and e) Adhesion Test. Results: The organoleptic test was carried out directly by looking at the shape and color and smelling the serum preparation of the ethanol extract of Tanah Hari tubers. The test results show that at F0 (0%) the color is clear, for F1 (0,5%) it is quite pale pink, F2 (1%) is bright pink and F3 (5%) is dark red. For scent organoleptic, F0 indicates no scent, for F1 and F2 there is a distinctive scent from the Hati Tanah tuber which is slightly pungent, while F3 shows a pungent aroma typical of the Hati Tanah tuber. The resulting serum has a thick texture at F0 and F1, a watery texture at F2 and a thinner texture at F3. All of the formulas have met the physical test requirement of organoleptic properties, homogeneity, pH, and adhesion test. Conclusion: The simplicia of Hati Tanah tuber can be made into an innovative cosmetic preparation in the form of serum with a concentration of 0,5%, 1% and 5%. From the results of testing the physical properties of the formulations, all of the formulas have met the physical test requirement of organoleptic properties, homogeneity, pH, and adhesion test.