A deburring device, comprising: a main body support, a lifting assembly, and a rotary burr brushing assembly and positioning and clamping assemblies, wherein the lifting assembly is fixed at the bottom of the main body support, the rotary burr brushing assembly is fixed at the upper end of the lifting assembly, and the lifting assembly can drive the rotary burr brushing assembly to move up and down in the vertical direction to adapt to inner cavities of workpieces with different depths, and wherein the plurality of positioning and clamping assemblies are uniformly arranged on the top circumference of the main body support, and the positioning and clamping assemblies are configured to position the workpiece on the main body support and clamp the workpiece, wherein the rotary burr brushing assembly comprises: a rotating assembly, a fixing plate, springs, brush holders (14, 15, 16, 17), brushes (22, 23, 24, 25) and positioning posts, the rotating assembly is fixed at the upper end of the lifting assembly, the fixing plate is fixed at the upper end of the rotating assembly, and the rotating assembly is configured to drive the fixing plate to rotate; the brushes (22, 23, 24, 25) are fixed in the brush holders (14, 15, 16, 17), the brush holders (14, 15, 16, 17) are fixed on the fixing plate, and the springs are arranged between the bottom surfaces of the brush holders (14, 15, 16, 17) and the fixing plate; a through hole is formed in the bottom surface of each brush holder (14, 15, 16, 17), the positioning posts pass through the through holes in the bottom surfaces of the brush holders (14, 15, 16, 17), the lower ends of the positioning posts are fixed on the fixing plate, and the positioning posts are positioned between the bottom surfaces of the brush holders (14, 15, 16, 17) and the fixing plate and are sleeved with the springs, so that, in use, when the brushes (22, 23, 24, 25) are subjected to pressure, the brush holders (14, 15, 16, 17) are capable of moving down in the vertical direction and compress the springs; one or more groups of brush holders (14, 15, 16, 17) are arranged, each group includes a plurality of brush holders (14, 15, 16, 17), and the plurality of brush holders (14, 15, 16, 17) in each group are closely arranged in the radial direction of the circumference of a workpiece. a main body support, a lifting assembly, and a rotary burr brushing assembly and positioning and clamping assemblies, wherein the lifting assembly is fixed at the bottom of the main body support, the rotary burr brushing assembly is fixed at the upper end of the lifting assembly, and the lifting assembly can drive the rotary burr brushing assembly to move up and down in the vertical direction to adapt to inner cavities of workpieces with different depths, and wherein the plurality of positioning and clamping assemblies are uniformly arranged on the top circumference of the main body support, and the positioning and clamping assemblies are configured to position the workpiece on the main body support and clamp the workpiece, wherein the rotary burr brushing assembly comprises: a rotating assembly, a fixing plate, springs, brush holders (14, 15, 16, 17), brushes (22, 23, 24, 25) and positioning posts, the rotating assembly is fixed at the upper end of the lifting assembly, the fixing plate is fixed at the upper end of the rotating assembly, and the rotating assembly is configured to drive the fixing plate to rotate; the brushes (22, 23, 24, 25) are fixed in the brush holders (14, 15, 16, 17), the brush holders (14, 15, 16, 17) are fixed on the fixing plate, and the springs are arranged between the bottom surfaces of the brush holders (14, 15, 16, 17) and the fixing plate; a through hole is formed in the bottom surface of each brush holder (14, 15, 16, 17), the positioning posts pass through the through holes in the bottom surfaces of the brush holders (14, 15, 16, 17), the lower ends of the positioning posts are fixed on the fixing plate, and the positioning posts are positioned between the bottom surfaces of the brush holders (14, 15, 16, 17) and the fixing plate and are sleeved with the springs, so that, in use, when the brushes (22, 23, 24, 25) are subjected to pressure, the brush holders (14, 15, 16, 17) are capable of moving down in the vertical direction and compress the springs; one or more groups of brush holders (14, 15, 16, 17) are arranged, each group includes a plurality of brush holders (14, 15, 16, 17), and the plurality of brush holders (14, 15, 16, 17) in each group are closely arranged in the radial direction of the circumference of a workpiece.