The construction of the feeding hole in Xingdong mine was taken as an example, the process of downpiping and pipe consolidation and safety precautions for the construction of the large-diameter ground feeding hole were introduced. In the construction process, according to the actual situation of the drilling tower's bearing capacity and the drilling rig's lifting capacity, 2 sets of 350 t cranes + wire rope lifting, crane card clamping, one-way check valve to reduce the weight of the casing and other construction method was used to lower the pipe. This method provided an implementable and economical construction process for the construction of large-diameter borehole downpipe in mine ground direct discharge well, gangue feeding, cable well and other special large-diameter boreholes.