Negative pressure stretcher capable of conveniently adjusting negative pressure cover

The invention provides a negative pressure stretcher capable of conveniently adjusting a negative pressure cover. The negative pressure stretcher comprises the negative pressure cover and a stretcherbody, wherein the negative pressure cover is fixedly connected with the stretcher body through a locking mechanism; the negative pressure cover comprises a first side plate and a second side plate; anair filter interface and a biological sign monitoring interface are connected to the outer side of the first side plate in a penetrating manner; a first fan-shaped sliding groove and a second fan-shaped sliding groove are fixedly formed in the inner side of the first side plate and the inner side of the second side plate correspondingly; sealing strips are slidably mounted in the first fan-shapedsliding groove and the second fan-shaped sliding groove correspondingly; and a first sliding rod, a second sliding rod, a third sliding rod and a fourth sliding rod are slidably mounted in the firstfan-shaped sliding groove an