A kind of pressed active carbon was prepared by H2SO4 and ZnCl2 complex activation method, using dehydrated sewage sludge and fine semi-coke as the raw materials. The following factors were considered such as pH, solid-to-liquid ratio and adsorption time in treating semi-coking wastewater which had been diluted 10 times. And then pressed active carbon was revived after adsorption. The single factor experiment and orthogonal experiments showed that the influencing factors of iodine sorption value by pressed active carbon were activation temperature, activation time and immersion ratio in turn. The optimum technological conditions were: the activation temperature was 750 ℃, the activation time was 2 h and the immersion ratio was 1:2.5 g/mL. The charring process of sewage sludge and fine semi-coke compound was made up of four steps, the first stage was adsorption water escape phase from room temperature to 200 ℃, while in the second stage between 200~338 ℃ sewage sludge released volatile matter such as CH4, CO2 and N2. Sewage sludge pyrolysized and formed semi-coke in the third stage from 338~642 ℃. Annaline decomposed and released sulfur dioxide exothermic peak at 640 ℃.The last stage semi-coke turned to coke and zinc chloride volatilized after 642 ℃. The pressed active carbon had the average hole diameter of 9 nm and specific area of 194 m2/g. Furthermore, the product contained alkane , arene, alcohol, hydroxybenzene and many other kinds of alkanes and oxygen containing functional groups.The results indicated that while in the condition of pH≈8, solid-to-liquid ratio was 1:30 g/mL and adsorption time was 32 h, the remove effect of ammonia nitrogen and chromaticity were best, which can reach to 83 % and 42 %.While after five times recondition，the iodine sorption value and compression strength of pressed active carbon reduced by 31 % and 62 % separately.