The invention discloses a coal mine underground water guiding borehole packer. The coal mine underground water guiding borehole packer comprises a hollow pipe body, polyurethane pipes, circular metalgaskets, fastening nuts, a pipe fixing ring, a guiding head, an injecting pipe, a grouting pipe, a water pipe, a liquid pressurizing device, a slurry pressurizing device and a water pressure gauge, wherein the guiding head is fixed to the front end of the hollow pipe body through a thread, the four polyurethane pipes are fixed on the hollow pipe body through the circular metal gaskets and the fastening nuts, the injecting pipe, the grouting pipe and the water pipe are located in the hollow pipe body, the injecting pipe is externally connected with the liquid pressurizing device, the grouting pipe is externally connected with the slurry pressurizing device, and the water pipe is externally connected with the water pressure gauge. The coal mine underground water guiding borehole packer is provided for the shortage of existing coal mine underground borehole plugging equipment, combines temporary sealing with permanent sealing to improve the quality of borehole plugging, and can display the water pressure change in a borehole in real time to provide early warning for coal mine permeation.