A method and device for BWP allocation are discloses. First, difference information between a first node and a second node is determined; then, whether an allocation condition is satisfied is determined according to the difference information and the reliability requirement of a service corresponding to a BWP needing to be allocated to the first node, and if the allocation condition is satisfied, the BWP is allocated to the first node in a time unit corresponding to the second node; and at this time, the second node can resist trailing signal interference by means of a coding gain, etc.