The invention relates to a magnetocardiogram detection device. The magnetocardiogram detection device comprises a first mounting plate provided with a plurality of first mounting parts in an array, the first mounting parts are provided with first arc-shaped guide holes and arc-shaped wiring holes, the first arc-shaped guide holes and the arc-shaped wiring holes are coaxially arranged, and a first rotating axis is defined by the first arc-shaped guide holes and the arc-shaped wiring holes; the first shells are used for mounting amplification circuit boards, the first shells are rotationally connected to the first mounting plate around corresponding first rotating axes, the first shells are provided with first sliding blocks penetrating through the first arc-shaped guide holes, and the first shells are provided with second arc-shaped guide holes; a second rotating axis crossed with the first rotating axis is limited by the second arc-shaped guide hole; and the second shells are rotationally connected to the first shell around a second rotating axis, the second shells are provided with second sliding blocks penetrating through the second arc-shaped guide holes, and the second shells are used for installing sensors. According to the magnetocardiogram detection device, magnetic interference to the sensor can be avoided; in addition, the attitude of the sensor can be adjusted.