The invention provides a mine and a mine construction method. The mine comprises ground vertical wells, ground horizontal wells, at least one branch well and a horizontal lane well. The ground vertical wells drill through an ore bed to be mined of the mine; the ground horizontal wells drill through the ore bed to be mined and extend along the dip direction, and the ground horizontal wells are positioned below the ground vertical wells; each branch well communicates with the ground horizontal wells, and each branch well extends upwards along the inverse dip direction; the horizontal lane well extends from the ore bed to be mined of the mine to the direction of the ground vertical wells, and the height of the horizontal lane well is the same with the height of a segments, located at the orebed to be mined, of the ground vertical wells; and the ground vertical wells are provided with cavity expanding sections, and the ground vertical wells communicates with the ground horizontal wells, the branch wells and the horizontal lane well through the cavity expanding sections. According to the mine and the mine construction method, the problem that water draining and air exhaust of a mine inan existing prior is inconvenient is solved.