TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Device: In the fermenting bed for fully degrading chicken manure at cage culture chicken house, the outside of the travel face of the track (3) is equipped with skid-proof teeth (3a), the upper of the skid-proof teeth (3a) is equipped with a safeguard edge (3b), the safeguard edge (3b) is fixed on the upper sidewall of the track (3) and the inside of the track (3) is a flat surface (3c). The travel tripper (2) comprises a roller (2a), stirring-up teeth (2b), a bottom frame (2c), an electric motor (2d), a reduction box (2e), an outer housing, an idler wheel (5), a travel drive gear (2g) and a travel driven gear (2h), the bottom frame (2c) is a square frame, the centre of the left border of the bottom frame (2c) is equipped fixedly with a left bearing (2n), the left end shaft of the roller (2a) is inserted into the pore of the left bearing (2n), the roller wall centre of the right end of the roller (2a) is equipped fixedly with a right bearing (2j), the electric motor (2d) is installed in the roller (2a), the fixed column at the bottom end of the electric motor (2d) is welded fixedly on the right border central part of the bottom frame (2c) by passing through the right bearing (2j), stirring-up teeth (2b) are welded on the surface of the roller (2a) at equal interval, the shaft of the electric motor (2d) is connected with the reduction box (2e), the inner wall of the roller (2a) is equipped with a tooth ring (2f), the drive gear (2k) of the reduction box (2e) is articulated with the tooth ring (2f) of the inner wall of the roller (2a), the travel drive gear (2g) is fixed on the shaft end of the roller (2a), the travel driven gear (2h) is fixed on the right border central part of the bottom frame (2c), the travel drive gear (2g) and the travel driven gear (2h) are blocked on the skid-proof teeth (3a) of the track (3), and the periphery of the outer housing is welded fixed on the border of the bottom frame (2c). The fermentation tank (1) is as wide and long as the chicken cage; four sides of the fermentation tank (1) are equipped with a working table (4). The length of the stirring-up teeth (2b) is 5-10 cm which is the distance from the tooth end to the tank bottom of the fermentation tank (1) when it rotates to the bottom part; there are three driven gears (2k) installed on the reduction box (2e) and blocked on the tooth ring (2f) of the inner wall of the roller (2a) at equal interval.