Chinese media reports that on Dec 12th something crashed in Zhangjiabian village, Fugu New District, causing a fire and leaving a large crater. The object also left quite a bit of debris.
While "Alien Spacecraft" is always a popular explanation, the most likely thing is that this is some space junk, most likely the remains of a Chinese rocket. Particularly as the object had some very human looking numbers written on it.
However it most closely resembles slag from a solid rocket booster, as seen in this NASA photo:
Here's a closeup of the main object found, the circular shape suggesting a rocket:
The two linkages at right angles suggest hydraulic actuator attachment points used to tilt the nozzle for steering. For example (on a liquid rocket, but similar principle):
Update: It is a nozzle connector ring, almost identical to one on this Chinese rocket motor: