Salvage type drilling-plug-free cementing well completion device

The invention discloses a salvage type drilling-plug-free cementing well completion device. The salvage type drilling-plug-free cementing well completion device can ensure an existing half-way cementing well completion mode of coal bed gas and improve the cementing quality. Meanwhile, after construction is finished, a special tool is put down to salvage a salvage assembly out of a shaft, drillingplug is avoided, the construction cost is reduced, and the well building period is shortened. After construction is finished, the special tool is put down, a recyclable inner core is salvaged out of the shaft, then the next operation procedure can be executed, the tool continues to be assembled after the recyclable inner core is repaired, and the purposes of reducing cost and improving efficiencyare achieved. A special soluble material technology is adopted, namely, an upper soluble sealing sleeve and a lower soluble sealing sleeve are added into the tool, the tool is intact before entering awell, after construction i