A slide rail, includes: a first sliding portion provided with a first magnetic part, the first magnetic part having an N pole and an S pole arranged alternately in a length direction of the slide rail; and a second sliding portion provided with a second magnetic part, the second magnetic part having an N pole and an S pole arranged alternately in the length direction, and the first sliding portion being slidably mounted to the second sliding portion in the length direction. During a relative sliding between the first sliding portion and the second sliding portion, the first magnetic part and the second magnetic part are opposite to each other, and are configured to switch between a state of attracting each other and a state of repelling each other.