A hanging type positioning and supporting device for a laser level, comprising: a fixed base; a sliding rod; and a connecting base, wherein one end of the sliding rod is connected to the fixed base, the connecting base is movably connected to the sliding rod in a matching manner, and a fastening piece that connects and fixes the laser level is provided on the connecting base, wherein the connecting base includes a top connecting disk, a rotary disk and a base disk, the connecting disk is provided with two lugs, and holes are formed in the lugs; and the fastening piece that connects and fixes the laser level is provided on an outer side of the base disk, characterized in that a transmission block is placed in the base disk of the connecting base, a hole is formed in the transmission block, and a nut is arranged in the hole; symmetrical through holes are formed in a base disk wall, a fine adjustment screw rod penetrates through a through hole on one side of the base disk wall, passes through the nut in the transmission block to string the transmission block, then penetrates through a through hole on the other side of the base disk wall, and adjusting knobs (15-1, 15-2) are arranged on both sides of the fine adjustment screw rod; a rectangular slot is formed in the rotary disk, and the transmission block is sleeved in the rectangular slot in a matching manner; a cylinder is arranged in the center of the base disk, the rotary disk sleeves the cylinder, a bearing is sleeved in a counter bore of the rotary disk, a pressing plate is arranged on the bearing and is fixed by a screw; and the top connecting disk of the connecting base sleeves the rotary disk and is fixed with the rotary disk. a fixed base; a sliding rod; and a connecting base, wherein one end of the sliding rod is connected to the fixed base, the connecting base is movably connected to the sliding rod in a matching manner, and a fastening piece that connects and fixes the laser level is provided on the connecting base, wherein the connecting base includes a top connecting disk, a rotary disk and a base disk, the connecting disk is provided with two lugs, and holes are formed in the lugs; and the fastening piece that connects and fixes the laser level is provided on an outer side of the base disk, a transmission block is placed in the base disk of the connecting base, a hole is formed in the transmission block, and a nut is arranged in the hole; symmetrical through holes are formed in a base disk wall, a fine adjustment screw rod penetrates through a through hole on one side of the base disk wall, passes through the nut in the transmission block to string the transmission block, then penetrates through a through hole on the other side of the base disk wall, and adjusting knobs (15-1, 15-2) are arranged on both sides of the fine adjustment screw rod; a rectangular slot is formed in the rotary disk, and the transmission block is sleeved in the rectangular slot in a matching manner; a cylinder is arranged in the center of the base disk, the rotary disk sleeves the cylinder, a bearing is sleeved in a counter bore of the rotary disk, a pressing plate is arranged on the bearing and is fixed by a screw; and the top connecting disk of the connecting base sleeves the rotary disk and is fixed with the rotary disk.