Abstract: In view of many problems existing in composting reactor of dead livestock and poultry in China, research and design of vertical composting reactor of dead livestock and poultry were carried out with goal of shortening composting cycle, reducing floor area and reducing environmental hazards．The reactor was mainly composed of crushing and stirring system, transmission system and temperature control system．On premise of mastering relevant composting process technology, key parameters of reactor such as volume, insulation thickness, heater power, and key components such as agitator shaft, agitator blade, and fixed knife were analyzed and designed．Simulation analysis was carried out by using finite original software, and results showed that a stable convective flow field could be formed inside the reactor, load of stirring knife was uniform, reactor design was reliable．