The invention discloses a paper box easy to open and close. The paper box comprises a bottom plate, a front side plate, a left side plate, a right side plate, a movable plate and a box cover, whereinthe front side plate, the left side plate and the right side plate are connected with the bottom plate and are perpendicular to the bottom plate, one side of the movable plate is connected with the box cover, the other side of the movable plate is connected with the bottom plate, the left side plate and the right side plate are separately connected with the front side plate, a first clamping corner and a second clamping corner are arranged on the box cover, the first clamping corner can be clamped at a joint between the front side plate and the left side plate, and the second clamping corner can be clamped at a joint between the front side plate and the right side plate. According to the paper box, a part needing to be adhered on a side part is omitted, so that box forming speed and environmental friendliness are improved; the sealing operation is simple and effective; during opening, due to the fact that the movable plate is changed into a free end, articles loaded in the paper box can be better taken out; and the cover is independently arranged, so that the cover is not easy to lose and high in integrity.