A novel combining vertical solid-liquid hydrocyclone mainly aims to solve the problems of unsmooth solid phase discharge and easy blockage of the prior swirler when used in solid-liquid phase separation. The utility model is characterized in that the lower part of an underflow cavity (5) is cone-shaped; the lowest end of the underflow cavity (5) is communicated with an underflow port (8). The utility model is characterized by smooth solid phase discharge, uneasy blockage and a simple structure.