The invention relates to an animal blood composition detecting device, and discloses an animal blood composition detecting and sampling device which is used for filtering and sterilizing animal bloodduring an extraction process and carrying out temporary storage and heating after extraction. According to the animal blood composition detecting device disclosed by the invention, the activity of cells in a blood sample of animal blood can be effectively increased, and the accuracy of blood composition detection data can be increased. The animal blood composition detecting device is characterizedin that a main body sleeve is arranged on a hollow rod in a sleeving way; two ends of the main body sleeve are respectively connected with the hollow rod; a blood storage cavity is arranged between the main body sleeve and the hollow rod; threads are arranged on the inner wall of the main body sleeve; two blood outlet holes are symmetrically formed in the hollow rod and are respectively communicated with the blood storage cavity; the diameter of the blood outlet holes is gradually increased from inlets to outlets; two blood inlet holes are symmetrically formed in the hollow rod and are respectively communicated with the blood storage cavity; the blood inlet holes are located above the blood outlet holes; the blood inlet holes have wide inlets and narrow outlets.