NOVELTY - The multifunctional butterfly stroke type solid-liquid separator, comprises a solid gathering barrel (2), a liquid gathering barrel (3), a bell-mouth-shaped butterfly grid rotor (4), and a shield (1). The shield is mounted on the solid gathering barrel. The liquid gathering barrel is mounted in the solid gathering barrel. The butterfly grid rotor is mounted in the liquid gathering barrel and provided with a filter screen (5) and driven to rotate by a motor. A liquid drain pipe is mounted at a bottom part of the liquid gathering barrel.    USE - The multi-functional butterfly stroke type solid-liquid separator is useful in sewage and biogas treatment, paper making, starch processing, and sugar and tobacco end product recycling applications.    ADVANTAGE - The separator is cost-effective and environment-friendly, has reduced energy consumption, and reduces degree of contamination of water.    DETAILED DESCRIPTION - The multifunctional butterfly stroke type solid-liquid separator comprises a solid gathering barrel (2), a liquid gathering barrel (3), a bell-mouth-shaped butterfly grid rotor (4), and a shield (1). The shield is mounted on the solid gathering barrel. The liquid gathering barrel is mounted in the solid gathering barrel. The butterfly grid rotor is mounted in the liquid gathering barrel and provided with a filter screen (5). The grid rotor is driven to rotate by a motor. A liquid drain pipe is mounted at a bottom part of the liquid gathering barrel. A discharge end of a crushing conveying pump is mounted in the grid rotor. An upper port of the butterfly grid rotor has relative large diameter. A transmission shaft is mounted at a bottom part of the butterfly grid rotor. A belt wheel is mounted at a lower end of the transmission shaft and connected with a motor belt wheel on an output shaft of the motor by a transmission belt. The solid gathering barrel is mounted on a separation stand whose upper and lower ends are formed with an opening. A solid material receiving pool is mounted below the solid gathering barrel. The transmission shaft is provided with an upper group of a bearing structure and a lower group of bearing structure. The crushing conveying pump is located in a sewage pool. A discharge end of the crushing conveying pump in the butterfly grid rotor is connected with a gas liquid mixer. A style converter is mounted at a lower end of the gas liquid mixer connected with a gas discharge end of a gas disperser. The gas liquid mixer comprises a vortex generator and a mixer shell. The vortex generator is connected with the gas disperser through an air conveying pipe for allowing the air to enter into the vortex generator. An upper end of the mixer shell is connected with the crushing conveying pump through a mixed liquid conveying pipe for inputting the mixed liquid into the mixer shell. The style converter at a lower part of the gas liquid mixer comprises a style converter shell and a fixed stirring wing fixed at a middle part of the style converter shell. A current guide grid is mounted on a wall surface of the lower part of the fixed stirring wing. The style converter shell is fixed at a bottom part of the butterfly grid rotor to rotate along with the butterfly grid rotor. The gas liquid mixer is fixed on the solid gathering barrel along with the air conveying pipe and the mixed liquid conveying pipe and aligned to central axial line of the butterfly grid rotor. The gas liquid mixing enters the style converter in 30 mm. A diameter of an edge of the upper port of the butterfly grid rotor is greater than a diameter of an upper port of the liquid gathering barrel. An upper port edge of the butterfly grid rotor is higher than the upper end of the liquid gathering barrel. The filter screen is mounted on a wall surface of an inner side of the butterfly grid rotor. The motor is mounted at a side of the separation stand or a lower part of the liquid gathering barrel.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a multi-functional butterfly stroke type solid-liquid separator.    Shield (1)    Solid gathering barrel (2)    Liquid gathering barrel (3)    Bell-mouth-shaped butterfly grid rotor (4)    Filter screen. (5)