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 . <EOS>