A belt buckle, comprising: a female buckle, comprising a base and a cover plate, an insertion slot being provided in the base, the cover plate being mounted on the base, the cover plate being provided with a protrusion, the cover plate being rotatable relative to the base, and the female buckle being used to connect to one end of a lace; a male buckle, comprising an insertion block and a male buckle main body, the male buckle main body being connected to the insertion block, a recess being provided in the end of the insertion block facing towards the cover plate, the male buckle being used to connect to the other end of the lace; wherein when the insertion block is inserted into the insertion slot, and the protrusion extends into the recess, the female buckle and the male buckle are fastened together; and an elastic member arranged on the end of the cover plate away from the male buckle; wherein when the cover plate is pressed, one end of the cover plate moves towards the base, the elastic member presses the base, and the other end of the cover plate lifts in the direction away from the base, so as to cause the protrusion to separate from the recess; wherein the base comprises a bottom plate, a first side plate, a second side plate, and a connecting piece; two sides of the bottom plate are respectively connected to the first side plate and the second side plate to form the insertion slot, two ends of the connecting piece are respectively connected to the first side plate and the second side plate, the connecting piece and the bottom plate are arranged at an interval, and the connecting piece is used for winding the lace; characterized in that the base further comprises a guard rod, the first side plate and the second side plate extend outward towards one end away from the bottom plate and are connected to both ends of the guard rod, and the guard rod is located on one side of the base away from the male buckle. a female buckle, comprising a base and a cover plate, an insertion slot being provided in the base, the cover plate being mounted on the base, the cover plate being provided with a protrusion, the cover plate being rotatable relative to the base, and the female buckle being used to connect to one end of a lace; a male buckle, comprising an insertion block and a male buckle main body, the male buckle main body being connected to the insertion block, a recess being provided in the end of the insertion block facing towards the cover plate, the male buckle being used to connect to the other end of the lace; wherein when the insertion block is inserted into the insertion slot, and the protrusion extends into the recess, the female buckle and the male buckle are fastened together; and an elastic member arranged on the end of the cover plate away from the male buckle; wherein when the cover plate is pressed, one end of the cover plate moves towards the base, the elastic member presses the base, and the other end of the cover plate lifts in the direction away from the base, so as to cause the protrusion to separate from the recess; wherein the base comprises a bottom plate, a first side plate, a second side plate, and a connecting piece; two sides of the bottom plate are respectively connected to the first side plate and the second side plate to form the insertion slot, two ends of the connecting piece are respectively connected to the first side plate and the second side plate, the connecting piece and the bottom plate are arranged at an interval, and the connecting piece is used for winding the lace; characterized in that the base further comprises a guard rod, the first side plate and the second side plate extend outward towards one end away from the bottom plate and are connected to both ends of the guard rod, and the guard rod is located on one side of the base away from the male buckle.