The invention relates to the technical field of brake mechanisms, and discloses a rotor brake mechanism suitable for a spherical motor, and a spherical motor, wherein the rotor brake mechanism is housed in a stator of the spherical motor, and includes a support assembly; the support assembly protrudes from the stator through the stator and protrudes from one end of the stator toward the rotor of the spherical motor; and the rotor brake mechanism drives the support assembly to move toward the support assembly or move toward the stator by rotation so as to enable the support assembly and the stator to abut or separate from each other, thereby causing the spherical motor to be in a locked or rotatable state. The invention is capable of making the rotor stop at any posture and remain stationary, and has a simple structure as well as low cost as the energy consumption is reduced.