The invention relates to a lower exhausting range hood which is arranged in a kitchen appliance--integrated cooker and can be easily dismounted for maintenance. The lower exhausting range hood comprises an upper smoke collecting chamber, a countertop, a rear back plate, a lower smoke collecting chamber, a lower smoke collecting chamber negative pressure generator and a smoke discharging pipe horizontally placed below the integrated cooker. The innovative point of the invention lies in that the a hollow right-angle toggle joint is arranged between the vertically downward air outlet of the negative pressure generator and the inlet of the horizontally placed smoke discharging pipe and is fixed on a shell, so when the lower exhausting range hood in the integrated cooker has a fault, the integrated cooker does not need to be integrally pulled out from a built cabinet and it is only need to open the countertop above the integrated cooker, dismount the upper smoke collecting chamber and disconnect the lower smoke collecting chamber integrally connected with the negative pressure generator so as to pull the lower exhausting range hood up from behind a disinfection cabinet for maintenance, which enables maintenance procedures to be substantially simplified, maintenance workload to be mitigated and damage to the built cabinet to different degrees to be avoided.