In this paper, Cost-effectiveness of various straw pulp wastewater treatment technologies were compared in detail, moreover the separate and combined process of Coagulation Sedimentation, Anaerobic Baffled Reactor, Sequencing Batch Reactor and Biological Aerated Filter processes were researched. The test result has showed that when addition dosage of PAM and PAC is 4mg/L and 80mg/L in Coagulation Sedimentation separately, and ABR HRT is 10h, the biodegradability of the straw wastewater increased from 0.25 after pretreatment to about 0.45. As the best SBR HRT is 8h, the CODcr removal rate was about 62%, the BOD5 removal rate was 70.7% averagely, and the treatment effectiveness is steady correspondingly. But in combined process, the CODcr removal rate of SBR unit is significantly increased to 78%, the CODcr removal rate of whole system is higher than 90%. Finally, the BAF has been applied to the advanced treatment on outwater of two biological treatment. The experimental results show that there is a good efficiency on the advanced treatment of the using the method, the CODcr of outwater is 78 mg/L, the BOD5 is 28 mg/L, the chroma is 32 times, the SS is 38 mg/L, and the treated water not only meets the state's new discharge standards (GB3544-2008), but also satisfies the requirements of reuse water, and the cost of whole treatment is only RMB 1.80 yuan / m3 wastewater.