An electronic device, comprising: a casing having an opening; a waterproof lid structure corresponding in position to the opening and comprising: a supportive sheet metal having an axle, with the axle pivotally connected to a side of the opening; a waterproof component for hermetically sealing the opening, with the waterproof component disposed on a side of the supportive sheet metal and corresponding in position to the opening; a movable latch lid for covering another side of the supportive sheet metal, with the movable latch lid penetrated by a plurality of passages; and a plurality of bolts corresponding in position to the passages, respectively, the bolts each comprising a rod portion and a head portion disposed at an end of the rod portion, wherein the rod portions pass through the passages and the supportive sheet metal, respectively, and another end of each said rod portion is fastened to the waterproof component, allowing the head portion to stop at an outer side of the movable latch lid, wherein the passages extend in a direction parallel to the axle and wherein a handle is protrudingly disposed on an outer side of the movable latch lid, whereas a latch portion is disposed on an inner side of the movable latch lid, wherein the opening has a fastening groove corresponding in position to the latch portion, such that the handle can be pushed to cause the movable latch lid to move along the direction of extension of the passages to a fastening position, allowing the latch portion to be latched into the fastening groove, and allowing the displacement of the movable latch lid to be limited by the length of extension of the passages. a casing having an opening; a waterproof lid structure corresponding in position to the opening and comprising: a supportive sheet metal having an axle, with the axle pivotally connected to a side of the opening; a waterproof component for hermetically sealing the opening, with the waterproof component disposed on a side of the supportive sheet metal and corresponding in position to the opening; a movable latch lid for covering another side of the supportive sheet metal, with the movable latch lid penetrated by a plurality of passages; and a plurality of bolts corresponding in position to the passages, respectively, the bolts each comprising a rod portion and a head portion disposed at an end of the rod portion, wherein the rod portions pass through the passages and the supportive sheet metal, respectively, and another end of each said rod portion is fastened to the waterproof component, allowing the head portion to stop at an outer side of the movable latch lid, wherein the passages extend in a direction parallel to the axle and wherein a handle is protrudingly disposed on an outer side of the movable latch lid, whereas a latch portion is disposed on an inner side of the movable latch lid, wherein the opening has a fastening groove corresponding in position to the latch portion, such that the handle can be pushed to cause the movable latch lid to move along the direction of extension of the passages to a fastening position, allowing the latch portion to be latched into the fastening groove, and allowing the displacement of the movable latch lid to be limited by the length of extension of the passages. a supportive sheet metal having an axle, with the axle pivotally connected to a side of the opening; a waterproof component for hermetically sealing the opening, with the waterproof component disposed on a side of the supportive sheet metal and corresponding in position to the opening; a movable latch lid for covering another side of the supportive sheet metal, with the movable latch lid penetrated by a plurality of passages; and a plurality of bolts corresponding in position to the passages, respectively, the bolts each comprising a rod portion and a head portion disposed at an end of the rod portion, wherein the rod portions pass through the passages and the supportive sheet metal, respectively, and another end of each said rod portion is fastened to the waterproof component, allowing the head portion to stop at an outer side of the movable latch lid, wherein the passages extend in a direction parallel to the axle and wherein a handle is protrudingly disposed on an outer side of the movable latch lid, whereas a latch portion is disposed on an inner side of the movable latch lid, wherein the opening has a fastening groove corresponding in position to the latch portion, such that the handle can be pushed to cause the movable latch lid to move along the direction of extension of the passages to a fastening position, allowing the latch portion to be latched into the fastening groove, and allowing the displacement of the movable latch lid to be limited by the length of extension of the passages.