This invention provides a multi-
wire cutting device and a method for improving the stability of the multi-
wire cutting process. The method includes: a measurement step: installing a main roller onto a multi-
wire cutting machine, such that at least two axial surfaces of the main roller respectively mate with the bearing surfaces in corresponding bearing housings to form a rotating pair, and measuring the wear state parameters of each axial surface; a temperature setting step: based on the relative differences in the wear state parameters of each axial surface, differentially setting the break-in target temperature for the corresponding bearing housing, so that the break-in target temperature for the bearing housing corresponding to the axial surface with poor wear is lower than the break-in target temperature for the bearing housing corresponding to the axial surface with good wear; a break-in step: with the
cutting wire wound around the V-groove of the main roller to form a
cutting wire mesh and the worktable not lowering, driving the main roller to drive the
cutting wire mesh to circulate at high speed for a certain period of time, while controlling the temperature of each bearing housing at the break-in target temperature set based on the wear state parameters of each axial surface; keeping the bearing temperature at a suitable temperature, slowing down the rusting process, thereby extending the service life of the
bearing surface and improving the stability of the multi-wire cutting process.