If I have to fly home in a few days, I have a kitchen knife to bring back, can I check it in?

Yes. Items that are prohibited from being carried on the passenger's person(s) but can be checked in as baggage:

Other kitchen knives, scissors, fruit knives, razors and other household knives and scalpels that can be used to endanger aviation safety. Butcher knives, carving knives and other professional knives, knives, spears, swords, halberds, etc. used in the performance of literary and artistic units, as well as axes, chisels, hammers, cones, weighted or spiked canes, iron-tipped trekking poles and other sharp and blunt instruments that can be used to endanger aviation safety.

Kitchen knives are air traffic control items and are not allowed to be carried on board. Random baggage check-in should be done at the airport.

And when handling the consignment, it is necessary to explain in advance, and such dangerous goods according to the provisions of the "Regulations on the Administration of the Transport of Dangerous Goods in Civil Aviation of China", dangerous goods must be wrapped in special packaging, and explain the situation to the staff who handle the procedures.

However, if it is a controlled knife prescribed by the state, such as a dagger switchblade, etc., it will be confiscated.

Use express delivery for a few dollars But now that many places have stopped shipping, what do you mean by consignment? If it's a post office, it's fine, but it's going to be slow...