The invention discloses a liquid nitrogen freezing-type rock cross-cut coal uncovering method. The method comprises the following steps: when the coal uncovering face is close to a safety rock pillar,the coal uncovering face is provided with several freezing boreholes, which pass through the safety rock pillar and the coal seam; the freezing boreholes are injected with water; thermometer holes are arranged at one side of the freezing boreholes, temperature tubes are distributed inside the thermometer holes, and the thermometer holes are sealed; a freezing tube and a slip-casting steel pipe are distributed in each of the freezing boreholes; the freezing boreholes are injected with slurry to fasten the coal body; liquid nitrogen is injected into the freezing tubes and the liquid nitrogen absorbs heat of the coal seam during the gasification process so as to freeze and solidify the coal seam; temperature of the coal seam at the freezing region is monitored by the utilization of the thermometer holes to ensure that the coal seam is fully frozen, and then rock cross-cut is uncovered. The method of the invention has short construction period, is time-saving, has a good solidification effect on the coal seam, and can help raise efficiency and safety of the rock cross-cut coal uncovering operation effectively.