NOVELTY - A compost reactor with multi-stage inoculation and trapezoidal stirring comprises a reactor main body, a top cover that is fixed on top part of the reactor main body, and an air outlet that is equipped over the top cover; where an air inlet sieve plate is fixed on lower part of internal space of the reactor main body; a reaction chamber is formed between the top cover and the air inlet sieve plate; and an air buffering chamber is equipped below the air inlet sieve plate where an air inlet is equipped and an air compressor is connected through the air inlet.    USE - The compost reactor with multi-stage inoculation and trapezoidal stirring is useful for industrial applications.    ADVANTAGE - In the compost reactor, water replenishing, inoculation and uniformly stirring can be carried out at random during the process of composting.    DETAILED DESCRIPTION - A compost reactor with multi-stage inoculation and trapezoidal stirring comprises a reactor main body, a top cover that is fixed on top part of the reactor main body, and an air outlet that is equipped over the top cover; where an air inlet sieve plate is fixed on lower part of internal space of the reactor main body; a reaction chamber is formed between the top cover and the air inlet sieve plate; an air buffering chamber is equipped below the air inlet sieve plate where an air inlet is equipped and an air compressor is connected through the air inlet; the bottom part of the air buffering chamber is equipped with a percolate outlet; a ladder type mixer comprises a main rotation shaft that is a hollow tube and rotatably and horizontally set in the reaction chamber; the external tube shell in one end of the main rotation shaft is connected to a transmission device outside the reaction chamber; the inner diameter of the hollow tube is connected to an inoculation case outside the reaction chamber through a pipeline; the two linkage rods are vertically and firmly fixed on two sides of the main rotation shaft; the two linkage rods of each side of a drive shaft are symmetrically arranged, and the linkage rods are hollows tubes; a certain number of blades are symmetrically arranged on two sides of the main rotation shaft, and the drive shaft is horizontally equipped between two linkage rods; the blades are hollow tubes where perforated inoculation holes are arranged; and the drive shaft, the linkage rods and interiors of the blades are communicated through hollow tubes.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the compost reactor with multi-stage inoculation and trapezoidal stirring.