The invention discloses a stratum rock debris supporting and packing device. The stratum rock debris supporting and packing device comprises a first cylindrical body and a second cylindrical body which are sequentially connected, a first hydraulic thrust system and a supporting mechanism are sequentially arranged on the side wall of the outer side of the first cylindrical body from top to bottom,and a second hydraulic thrust system, a packing mechanism and a fixing sleeve are sequentially arranged on the side wall of the outer side of the second cylindrical body from top to bottom; and the first hydraulic thrust system and the second hydraulic thrust system act on the supporting mechanism and the packing mechanism correspondingly, axially downward pressure is applied to the supporting mechanism and the packing mechanism simultaneously under the hydraulic effect, and therefore the supporting mechanism and the packing mechanism expand radially due to being pressed. According to the stratum rock debris supporting and packing device, the problems of fallen rock debris supporting and permanent acting are effectively solved, effective packing is conducted on the upper and lower well sections, it is ensured that a borehole section located below the stratum rock debris supporting and packing device is effectively protected, normal mining and packing can be conducted on an oil and gaswell, therefore the shaft quality is improved, and the oil and gas recovery rate is increased.