A parking mechanism, comprising: a housing; a rotary shaft; a parking pawl; a parking shift fork that is axially movable, the parking shift fork being axially movable to realize engagement or disengagement of the parking pawl in a parking gear; and an axially-limited guide device comprising: a parking bracket assembly configured to axially limit the parking pawl and guide the parking shift fork; and a guide block configured to be slidably engaged with an execution member disposed at an end of the parking shift fork to allow for a relative rotation of the parking pawl and the rotary shaft, wherein: the parking bracket assembly being fixedly connected to the housing comprises a parking bracket and a limiting portion abutting against the guide block, the limiting portion being configured to limit an axial movement of the guide block when the execution member disposed at the end of the parking shift fork is axially disengaged from the guide block; the guide block comprises a first guide portion having a support surface, the limiting portion being in contact with the support surface; an end of the limiting portion has a forced surface matching with the support surface; the first guide portion has a first guide surface, the execution member being guided by the first guide surface; and a projection of the limiting portion on a radial plane of the guide block has no overlap with a projection of the first guide surface on the radial plane of the guide block, characterized in that: the first guide surface is of a sector-ring shape; and a straight line where one of side edges of the forced surface is located is tangent to an outer ring of the first guide surface. a housing; a rotary shaft; a parking pawl; a parking shift fork that is axially movable, the parking shift fork being axially movable to realize engagement or disengagement of the parking pawl in a parking gear; and an axially-limited guide device comprising: a parking bracket assembly configured to axially limit the parking pawl and guide the parking shift fork; and a guide block configured to be slidably engaged with an execution member disposed at an end of the parking shift fork to allow for a relative rotation of the parking pawl and the rotary shaft, wherein: a parking bracket assembly configured to axially limit the parking pawl and guide the parking shift fork; and a guide block configured to be slidably engaged with an execution member disposed at an end of the parking shift fork to allow for a relative rotation of the parking pawl and the rotary shaft, wherein: the parking bracket assembly being fixedly connected to the housing comprises a parking bracket and a limiting portion abutting against the guide block, the limiting portion being configured to limit an axial movement of the guide block when the execution member disposed at the end of the parking shift fork is axially disengaged from the guide block; the guide block comprises a first guide portion having a support surface, the limiting portion being in contact with the support surface; an end of the limiting portion has a forced surface matching with the support surface; the first guide portion has a first guide surface, the execution member being guided by the first guide surface; and a projection of the limiting portion on a radial plane of the guide block has no overlap with a projection of the first guide surface on the radial plane of the guide block, characterized in that: the first guide surface is of a sector-ring shape; and a straight line where one of side edges of the forced surface is located is tangent to an outer ring of the first guide surface. the first guide surface is of a sector-ring shape; and a straight line where one of side edges of the forced surface is located is tangent to an outer ring of the first guide surface.