The invention relates to the field of 'three-under' coal compressing mining, and provides a method for controlling surface collapse in the coal mining process. The method comprises the following stepsthat sampling holes are formed in the surface; all rock stratums are sampled through the sampling holes so as to obtain layer position information of a main key stratum and all interior key strata; according to the layer position information of the main key stratum and all the interior key strata, a plurality of slurry-injecting holes extending to the grouting layer position correspondingly are formed in the surface in the advance direction of a working face; the grouting layer position is the contact face of the main key stratum and a weak layer on the lower portion of the main key stratum;water is injected into the slurry-injecting holes through a high-pressure pump; and coal mining is conducted in the advance direction of the working face, meanwhile, whether the water pressure in allthe slurry-injecting holes is decreased or not is judged, and if yes, pre-mixed coal ash slurry is injected into the corresponding slurry-injecting holes through the high-pressure pump. According to the method, the grouting time is judged through the change of the water pressure in the pre-formed slurry-injecting holes, the situation that the main key stratum is broken off in the coal mining process is avoided, and maximum surface subsidence reducing in the sense of space conservation is achieved.