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 . <EOS>