The utility model relates to a rotary-liquid solid-liquid separation type SBR (Sequencing Batch Reactor Activated Sludge Process) domestic sewage treatment device comprising a vertical flow type SBR reaction tank, a water inlet pipe, an intermittent aeration device, a water outlet pipe and a mud discharge pipe. The device is characterized in that the upper part of the side wall of the reaction tank is provided with an overflow pipe, and a suspended packed bed is arranged in the tank; and a tangential water inlet pipe at the upper part of an additionally arranged hydrocyclone separator is connected with the overflow pipe, a mud return pipe at the bottom of the hydrocyclone separator is connected at the bottom of the side wall of the reaction tank communicated with the mud discharge pipe, and the water inlet pipe is arranged at the top of the hydrocyclone separator; and the volume of the suspended packed bed occupies 60 to 80 percent of volume of the reaction tank, and the volume ratio of the reaction tank to that of the hydrocyclone separator is 5:1 to 9:1; and the application steps are as follows: firstly: biofilm formation culturing at the suspended packed bed; secondly: normal operation of SBR, continuous water inlet and outlet and intermittent aeration; and thirdly: water discharge. The device has the advantages of increasing the denitrification and dephosphorization efficiency as well as the utilization rate of tank volume, having stable water quality and saving the construction investment.