The invention relates to compound bacteria for biological bacteria liquid pulping and application of the compound bacteria. The invention also provides a biological bacteria liquid pulping method. The compound bacteria comprise bacillus stored with a number of CGMCC No. 5971, rheinheimera tangshanensis stored with a number of CGMCC No.5972, and Wickerhamomyces anomalus stored with a number of CGMCC No. 5975. The method mainly comprises the following steps of: preparing bacteria liquid; processing raw materials; and pulping, wherein pulping steps comprise the following steps of: defibering, carrying out biodegradation, sterilizing through steam, carrying out rough pulping, carrying out fine pulping, screening a sizing agent, removing latency, and washing the sizing agent. A paperboard prepared by the biological bacteria liquid pulping method provided by the invention reaches a level over AA grade; waste liquid produced in a pulping process can be recycled or transformed into methane which can be served as an energy resource or organic fertilizer, and therefore, energy resources are saved, and environment protection is achieved.