A support apparatus, wherein the support apparatus comprises a stylus fastener, the stylus fastener is configured to fasten a stylus, a magnet of the stylus comprises a first wall surface and a second wall surface facing away from the first wall surface, and a polarity of the first wall surface is opposite to that of the second wall surface, the stylus fastener comprises an annular body and a mounting space formed by the body, the body is magnetic and comprises an inner wall surface and an outer wall surface, the inner wall surface faces the mounting space, the outer wall surface faces away from the inner wall surface, the inner wall surface has a first polarity, the outer wall surface has a second polarity, and the first polarity is opposite to the second polarity; and the stylus is mounted in the mounting space in an X-axis direction, so that the stylus fastener is sleeved onto a periphery of the stylus, and the X-axis direction is a length direction of the support apparatus; and both the first wall surface and the second wall surface are disposed opposite to the inner wall surface, characterised in that a first magnetic force is generated between the first wall surface and the inner wall surface, a second magnetic force is generated between the second wall surface and the inner wall surface, and the first magnetic force and the second magnetic force have a difference, so that the stylus can be magnetically fastened to the stylus fastener by using the magnet, wherein in a direction around the X axis, the inner wall surface of the body comprises a first area and a second area, and a density of magnetic lines of the first area is higher than that of the second area; and wherein, in the direction perpendicular to the X axis, the first wall surface is opposite to a part of the first area or the entire first area, and the second wall surface is opposite to a part of the second area or the entire second area, and wherein the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force. the stylus is mounted in the mounting space in an X-axis direction, so that the stylus fastener is sleeved onto a periphery of the stylus, and the X-axis direction is a length direction of the support apparatus; and both the first wall surface and the second wall surface are disposed opposite to the inner wall surface, characterised in that a first magnetic force is generated between the first wall surface and the inner wall surface, a second magnetic force is generated between the second wall surface and the inner wall surface, and the first magnetic force and the second magnetic force have a difference, so that the stylus can be magnetically fastened to the stylus fastener by using the magnet, wherein in a direction around the X axis, the inner wall surface of the body comprises a first area and a second area, and a density of magnetic lines of the first area is higher than that of the second area; and wherein, in the direction perpendicular to the X axis, the first wall surface is opposite to a part of the first area or the entire first area, and the second wall surface is opposite to a part of the second area or the entire second area, and wherein the first magnetic force is greater than the second magnetic force, and the first magnetic force is a magnetic adsorption force.