Drilling ramming and expanding equipment for compaction pile and using method of drilling ramming and expanding equipment

The invention discloses a compaction pile drilling ramming and expanding device, and relates to the technical field of foundation construction, the compaction pile drilling ramming and expanding device comprises an operation platform, and the top of the operation platform is provided with a test assembly. An air pump is started, under the air suction effect of the air pump, a piston and a traction rope pull a magnetic block, a tension meter, a fixing block, a traction chain and a ramming and expanding assembly till an impact hammer is pulled to the highest position, at the moment, the air pump is stopped, and an electromagnetic valve is opened, so that air enters an exhaust pipe instantly, the impact hammer falls instantly, and first-time ramming of a compaction pile is completed; closing the electromagnetic valve, starting the air pump, enabling the air pump to suck the piston downwards again, observing the height of the iron ball sucked to the graduated scale by the magnetic block at the moment that the ten