The invention discloses coal mine tunnel bottom board anchor rod stable drilling equipment and a using method thereof. The coal mine tunnel bottom board anchor rod stable drilling equipment comprises an under frame (1), a vertical frame (2), an upper frame (3), inclined struts (4), a working device (5) and an equipment positioning device (6), wherein the under frame and the upper frame are horizontally arranged; the bottom end of the vertical frame is fixedly connected with the front end of the under frame, and the top end of the vertical frame is fixedly connected with the rear end of the upper frame; the multiple inclined struts are respectively, obliquely and fixedly arranged between the under frame and the vertical frame as well as between the vertical frame and the upper frame; the working device is arranged on the upper frame, and comprises a body (51), a front-back guiding mechanism (52), a front-back positioning mechanism (53), a left-right guiding mechanism (54), a left-right positioning mechanism (55) and a drilling machine installation frame (56); the equipment positioning device is fixedly arranged on the under frame. The coal mine tunnel bottom board anchor rod stable drilling equipment disclosed by the invention is simple in structure, and a backward supporting force is provided for a drill rod of a drilling machine through the equipment positioning device, so that rapid drilling operation on a tunnel bottom board can be realized, and the requirement on rapid tunnel forming is met.