The invention discloses an intelligent blood sampling device capable of achieving automatic needle exchange. A propeller is removed from a needle insertion adjustment support at the tail end of an operation arm of an existing blood drawing robot, a needle exchange mechanism, a needle push mechanism, a blood drawing needle separation mechanism and a needle seal mechanism are added, the improved robot is provided with a specific syringe, through the structure, the improved blood drawing robot can automatically complete the processes of needle exchange, blood drawing, needle seal and needle separation, the manual labor amount is greatly reduced, the automation process of blood drawing of the robot is achieved, needle taking is conducted conveniently, the problem is effectively avoided that people are more easily scratched by a syringe needle during needle taking or assembly, and the device has high economic and practical value; meanwhile, by adopting the needle seal structure, a needle cover covers the syringe needle, bacteria in air can be prevented from entering blood of the syringe from a syringe needle hole, the precision of following blood detection can also be improved accordingly, and the device is safe and hygienic.