Antimicrobial solid soap as the name implies, product designed to kill germs on the hands or body, soap in solid form and it has antimicrobial properties. It is a cleansing agent and also it is a multipurpose cleanser. The production of antimicrobial solid soap from the mixing of animal fat and castor oil, through serious of main production steps, those are saponification, glycerin removal, soap purification, finishing with different ratio fats and castor oil. During the production process the ratio which is 50:50, 25:75 and 0:100 percent of castor oil and fat was taken respectively. The specific parameters of the product, percent inhibition of bacterial growth, specific gravity, hardness, foam length, power of clearance, yield of soap and, moisture content of solid soap, was characterized. The following results were obtained, percent inhibition of growth of bacterial 31.1%, specific gravity 0.97, hardness 1cm, foam length 7.75 cm, power of clearance relatively good & higher, yield of soap 40%, moisture content 17% and the alkalinity of solid soap is about 8.6 and also from this experiment the eucalyptus oil have been extracted and characterized, specifically boiling point (0 c), specific gravity, refractive index at 200c, dynamic viscosity at room temperature (pa.s) and yield of the extracted oil with the values 155.30c, 0.952, 1.338, 0.0009 pa.s and 20% respectively. The product characteristics were compared with other commercial (roha) antimicrobial soaps and the product is found to have relatively equivalent characteristics to that of the commercial soap. Finally best result in production of antimicrobial soap was obtained with physical characteristics of medium softness and odor at the ratio of 25% of castor oil, 75% of animal fat and 3% of eucalyptus oil in order to produce 50 gram of antimicrobial solid soap.