The invention relates to a device and a method for detecting the continuity of a heat insulation board of a wall, and belongs to the technical field of building detecting equipment. The detecting device is characterized by comprising a detecting board (9), a sound isolation cover (8) and a control device, wherein the middle part of one side of the sound isolation cover (8) is depressed to form aninstallation cavity (10); a sound isolation cavity of the sound isolation cover is arranged in the sound isolation cover (8) and covers the installation cavity (10); granular or powdery solid is filled into the sound isolation cavity of the sound isolation cover; the detecting board (9) is embedded into the installation cavity (10); a plurality of groups of sound receiving and transmitting modulesare arranged at one side, near the opening end of the installation cavity (10), of the detecting board (9); the control device is connected with the sound receiving and transmitting modules, and is used for controlling the sound receiving and transmitting modules to gradually work. The device for detecting the continuity of the heat insulation board of the wall has the advantage that the continuity of the heat insulation board in the wall can be judged, so that the destroying to the wall is not needed. The detecting method is used for comparing the change of sound received by receiving partswith equal distance with a sounding part, so as to judge the discontinuity part of the heat insulation board.