Pig serum collecting device for pig farm

The pig serum collecting device for the pig farm comprises a collecting needle cylinder, a drawing assembly and a needle head, the drawing assembly is connected to an inner cavity of the collecting needle cylinder in a sliding and penetrating mode, the needle head is installed at one end of the collecting needle cylinder in an interference pressing mode, and a protection assembly is arranged at the end of the collecting needle cylinder and located at the position outside the needle head. The protection assembly comprises a protection end cover with a hollow inner cavity, a gasket piece is fixedly arranged at one end of the protection end cover, and the protection end cover is arranged at the end of the outer wall of the collection needle cylinder in a telescopic position adjusting and sleeving mode. According to the utility model, the protective end cover capable of telescopically adjusting the position is arranged at one end of the collection needle cylinder with the needle head, and the gasket sheet on the