According to some problems in measuring the deformation of artillery parts, such as complex structure, large geometric range and regular disassembly, a new method for measuring the deformation quantity of artillery parts is proposed. Laser radar and standard sphere measurement principles are used by the method and computer control in real time and data processing are performed. Experimental measurement of the artillery tube with 8 m length is carried out, the repeatability measurement accuracy is less than 0.13 mm, and the measurement accuracy can meet the measurement requirements of deformation quantity of artillery parts.