Horizontal screw centrifuge and sealing device

The embodiment of the utility model provides a horizontal screw centrifuge and a sealing device, the horizontal screw centrifuge comprises a rotary drum, the rotary drum at least comprises a first part section and a second part section, and a groove is formed between the first part section and the second part section. The sealing device comprises a blocking piece and a sealing piece, the blocking piece extends into the groove, the sealing piece is arranged on the blocking piece and seals the groove, and therefore leakage of liquid into the groove is reduced. Furthermore, a first liquid discharging hole is formed in the sealing piece, a liquid blocking piece is further arranged at the position of the sealing piece, an inner cavity and a second liquid discharging hole are formed in the liquid blocking piece, a small amount of liquid leaking into the groove can be discharged through the first liquid discharging hole, the inner cavity and the second liquid discharging hole, and the using effect of the sealing dev