The invention discloses a wastewater treatment device adopting a tubular membrane. The wastewater treatment device adopting the tubular membrane comprises a concentration pool for alkaline adjustmentof pH, a tubular membrane assembly, a water producing tank, a raw water pipeline and a water producing pipeline; wastewater is conveyed to the concentration pool through a wastewater collection pipeline, the concentration pool communicates with the tubular membrane assembly through the raw water pipeline, a circulating pump is installed on the raw water pipeline, the tubular membrane assembly comprises a water producing outlet, the water producing outlet communicates with the water tank through the water producing pipeline, a water suction pump is arranged at the position, close to the tubularmembrane assembly, of the water producing pipeline, the circulating pump is matched with the water suction pump for use, and the circulating pump and the water suction pump act the tubular membrane assembly; a backwashing assembly for cleaning the tubular membrane assembly is further connected to the water producing pipeline in parallel; and a reflux inlet is further formed in the tubular membrane assembly, a reflux pipeline is connected to the reflux inlet, the far end of the reflux pipeline extends to the concentration pool, and forced concentration circulation is formed. The wastewater treatment device adopting the tubular membrane saves power consumption, and can reduce the operation cost of the device.