The invention discloses a two-way cutting device for automobile lining molding. The two-way cutting device comprises a two-way water cutting mechanism, a workbench and waste treating mechanism and an electronic control system. The two-way water cutting mechanism comprises a machine base, a rotating motor, a lower arm, a middle arm, an upper arm, a first hinge motor, a second hinge motor, a return rod, a return spring, a transverse rod, a water tank, a water pipe, a water cutting knife fixing arm, a water cutting knife and a high pressure pump. The workbench and waste treating mechanism comprises a water cutting table, an inside roof lining mold, an adjusting rod, a waste tank, a foot stand, a waste door, a waste pumping pipe, a pressure division valve, an exhaust fan and a waste pool. The electronic control system comprises a master pipe bundle, an electric control cabinet and a wire pipe. An inside roof lining can be cut through the two-way water cutting mechanism, waste can be treated through the workbench and waste treating mechanism, different electronic programs can be input through the electronic control system to achieve linkage control over the whole device, and the two-way cutting device has the effects of being capable of achieving automatic cutting, being high in precision, fast in speed and quick in waste water discharge, being free of blockage, saving labor and lowering labor intensity.