The invention provides a coupling device and a coupling method for a tunnel seismic wave method advanced geological forecast detector sleeve. The device comprises a hollow outer sleeve, wherein a plurality of elastic steel sheets are distributed on the periphery of the outer side of the outer sleeve, each elastic steel sheet is provided with a protruding part which protrudes outwards under the condition that no external force is applied to the elastic steel sheet, and the protruding parts are compressed after being applied with an external force; and the elastic steel sheets are movably connected with the outer sleeve by means of connecting pieces. When in use, the coupling device sleeves a position where an opening of the detector sleeve is coupled and anchored with a hole, and is used for indirectly coupling the detector sleeve with the hole opening, and the detector sleeve can be pulled out more smoothly after the operation is finished.