The invention discloses a method for replacing a coal column by floor heaving top connecting. According to the characteristic that an expanded or soft stratum is easy to heave, an expanded or soft base plate in a gob is expanded by utilizing the characteristics of high ground pressure, high side pressure, high broken expansion and high expansion after encountering water; a particular measure is adopted, so that the expanded or soft base plate in the gob (4) is heaved and is in tight contact with a top plate (1) so as to achieve the effective supporting effect, and the bearing core area of the coal column (2) is broken, and a bearing main body is converted into a heaved base plate (3) from the original coal column (2); after effective supporting, an original stripe is recovered, or the coal column (2) left in a mine is exploited in a room-and-pillar method. The method for replacing the coal column by floor heaving top connecting has the obvious effect of increasing the recovery rate on rock masses which are expanded after encountering the water or the soft base plate coal mine; moreover, a protection technology is simple; relevant equipment required for solid waste, paste or slurry filling is not required to be equipped; the investment, tunneling and shoring costs are reduced greatly.