Up-flow anaerobic biological filter bed reactor

The invention discloses an up-flow anaerobic biological filter bed reactor which comprises a reactor body, wherein a biological mud bed area, a biological mud suspension area and a methane overflow area are sequentially arranged in the reactor body from bottom to top; a biological mud circulating system is arranged at the bottom of the biological mud bed area of the reactor body; a floating packing layer is arranged in the biological mud suspension area; and a discharge system is arranged at the top of an upper clarification area of the reactor body. According to the up-flow anaerobic biological filter bed reactor, a balanced water distribution system, a stirring device and a gas striping structure with a complicated structure in the prior art are replaced with the biological mud circulating system, so that sewage is fully mixed with the biological mud to obtain a relatively good mass transfer condition; and the bacteria storage amount of anaerobic biological bacteria is increased by arranging the floating packing layer in the biological suspension area, so that the sewage treatment capacity of the up-flow anaerobic biological filter bed reactor can be effectively improved and maintained for a long period of time.