The invention provides a brass instrument practice apparatus and is suitable for being used in a woodwind instrument such as a saxophone. A neck tube comprises a body and a connection assembly, wherein the body is tubular and has a first end and a second end, the connection assembly comprises a connection tube fixed at the second end and a fastening ring, the connection tube is used for setting atube body of the woodwind instrument, the fastening ring is sleeved with the tube body and is used for fastening the tube body and the connection tube, and the density of at least one of the connection tube and the fastening ring is smaller than that of the body. The connection assembly with relatively low density is utilized, energy loss during vibration transmission between the neck tube and thetube body is reduced, the musical instrument resonance effect is maintained, and the relatively large playing volume is acquired.