The invention relates to a movable earthworm bed which is characterized by comprising a fermentation tank (1), wherein the bottom of the fermentation tank (1) consists of bracket bars (9), a bearing (10) and a screw net (2); a plurality of bracket bars (9) are arranged; one end of each bracket bar is fixed at the lower end of the body of the fermentation tank (1); the other end of each bracket bar is fixed on the bearing (10); the screen net (2) is arranged at the bottom of the bracket bars (9) and the bearing (10); a rotating shaft (3) is fixedly arranged inside the fermentation tank (1); spiral blades (4) are connected with the rotating shaft (3). The movable earthworm bed is simple in structure and convenient to use; when the movable earthworm bed is applied to an earthworm compositing technique, the acting range of earthworms is mainly at a middle layer, so that sludge with organic garbage raw materials can be continuously added into the upper layer, and earthworm manure and composted fertilizers can be continuously produced at the lower layer.