NOVELTY - System comprises a high-temperature heating furnace (5) equipped with a coke reactor (4) filled with straw material (6) and an end cover (2) of the coke reactor provided with a protective gas inlet and a protective gas outlet. The coke reactor is provided with a flue at the side wall of the upper opening. The flue is connected to a tar collecting container (8) through a condenser. The upper end of the tar collecting container is connected to a pyrolysis gas collecting container via a pipeline and a vent-pipe (10).    USE - The system is useful for preparing high activity straw coke (claimed).    ADVANTAGE - The method is suitable for preparing high activity straw coke using straw biomass of high alkali metal content.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing high-activity straw coke using the system for comprising: (i) filling the coke reactor with straw biomass of particle diameter 50-200 mu m, where the volume is not greater than three quarters of the reactor; (ii) placing the coke reactor in the high-temperature heating furnace, opening the end cover of the reactor, filling nitrogen protective gas for more than 3 hours to drive the residual air in the coke reactor; (iii) heating the high-temperature heating furnace to 775-825 degrees C at a heating rate of 2-10 degrees C/minute and maintaining temperature for 4 hours; (iv) passing the generated coke tar and smoke to the condenser through a valve for condensation, and passing the condensed tar into the tar collecting container and the pyrolysis gas residues into the downstream of pyrolysis gas collecting container; and (v) lifting the coke reactor from the high temperature heating furnace, and continuously introducing nitrogen gas until the coke reactor cools to room temperature and obtain the prepared sample.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the system (Drawing includes non-English language text).    End cover (2)    Coke reactor (4)    High-temperature heating furnace (5)    Straw material (6)    Tar collecting container (8)