Sewage treatment device and sewage treatment system

The utility model belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device and a sewage treatment system, the sewage treatment device comprises a box body, the box body is divided into an equipment room and an anoxic biochemical pool, a first aerobic biochemical pool and a second aerobic biochemical pool which are communicated in sequence; a controlcabinet, and a suction pump, a heating assembly and an air supply unit which are connected with the control cabinet respectively are arranged in the equipment room; the air supply unit is communicated with the heating assembly so as to provide hot air for the anoxic biochemical pool, the first aerobic biochemical pool and the second aerobic biochemical pool, and a water outlet of the second aerobic biochemical pool is communicated with the suction pump. The air supply unit can provide sufficient air for the interior of the heating assembly; by controlling the temperature in the box body through the heating assembly,