The invention provides a design method of an anti-collision barrel device of a washing machine. The anti-collision barrel device has a guiding rod and a damping piece, and the guiding rod has an emptysection in the middle and working sections at both ends of the empty section; the design method is a design method of the anti-collision barrel device under the parameters of the washing machine suchas the eccentric mass of the washing machine, the minimum distance between an outer tube and a box body and the like, is mainly used for providing the horizontal damping force, can prevent the washing machine from colliding at low speed dehydration, and can ensure that the noise of the whole machine does not increase if the vibration transmitted to the box body during high-speed dehydration is increased, which requires that the anti-collision barrel device gives sufficient damping force when the outer tube vibrates greatly, and it is avoided that the outer tube collides with the box body; inthe safe amplitude of the stable operation of the outer tube of the washing machine, the anti-collision barrel device gives less damping force or no damping force; according to the known condition ofthe washing machine, the main parameters of the anti-collision barrel device designed for the washing machine are deduced.