The utility model relates to a multilayered fracturing string used in the petroleum well and the natural gas well. The utility model is characterized in that the multilayered fracturing string has a plurality of fracturing devices, the quantity of which is adapted with the quantity of gas layers. One fracturing device is arranged between every two adjacent gas (oil) layers. The fracturing devices are connected with each other in series at the lower end of a gas producing pipe. A seat sealing steel ball base is arranged at the lower end of the last fracturing device. The fracturing device comprises a sand-blasting slide sleeve, a hydraulic anchor, a packer and a ball collecting seat which are arranged from top to bottom and are connected into an integrated one. The periphery of the packer is sealed with the internal wall of the gas well sleeve to separate the inner space of the gas well sleeve. The anchor tip of the hydraulic anchor supports the internal wall of the gas well sleeve to fix the fracturing device on the gas well sleeve. The fracturing string has a plurality of fracturing devices, so three layers or more than three layers of fracturing reconstruction can be finished only with one time of string operation, and multilayer coal can be commingled to exploit. The multilayered fracturing string is mainly used in high pressure gas well, and can also be applied in the oil well.