Flowmeter overload protection device and flowmeter

The invention provides a flowmeter anti-overload device and a flowmeter. The anti-overload device comprises an in-pipe base, an out-pipe base, a transverse limiting rod, a lifting rod, an adjusting bolt and a spring, the out-pipe base is connected with the in-pipe base, a vertically-through first sliding groove is formed in the out-pipe base, a transversely-through second sliding groove is formed in the in-pipe base, the first sliding groove is communicated with the second sliding groove, the lifting rod is slidably arranged in the first sliding groove, the transverse limiting rod is slidably arranged in the second sliding groove, a driving inclined face is formed on the lower section of the lifting rod, a driving part making contact with the driving inclined face is formed on the transverse limiting rod, the spring is arranged between the transverse limiting rod and the in-pipe base to drive the driving inclined face of the lifting rod to keep making contact with the driving part, the adjusting bolt is only