The invention discloses a magnetic confinement device and method of HeNe laser beam bunching, and relates to the technical field of laser measurement. The device comprises a four-dimensional motion platform (101), a magnetic confinement device body and a facula dimension sensor (109) in sequence, the four-dimensional motion platform (101) is used for containing a HeNe laser (102), the magnetic confinement device body is used for laser beam bunching, and the facula dimension sensor (109) is used for detecting laser beam bunching performance. The magnetic beam bunching device body mainly comprises a mutual-exclusion magnetic confinement body (108) capable of rotating at high speed, the mutual-exclusion magnetic confinement body (108) is composed of a plurality of pairs of magnetic bodies with opposite polarities, a magnetic cavity (107) is formed in the middle of the mutual-exclusion magnetic confinement body (108), and laser beams emitted by the HeNe laser (102) can penetrate through the magnetic cavity (107). When the laser penetrates through the magnetic cavity, due to the fact that light ray deflection occurs to the laser in a mutual-exclusion magnetic field, the peripheral light rays of the laser beams are made to deviate towards the center, and therefore the aim of improving the laser beam bunching performance is achieved.