The utility model discloses a measuring device of roller table bearing play of a continuous caster. The measuring device comprises a pedestal, a jack mounted on the pedestal and having an elevating part, a jacking carriage fixed onto the top end of the elevating part and capable of supporting a roller table, and a measuring member capable of measuring the elevating distance of the elevating part of the jack. During the use of the measuring device of the roller table bearing play of the continuous caster, measurement can be conducted when the connection between a bearing and the bearing seat and the connection between the roller table and the bearing are maintained, and the bearing seat needs not to be decomposed. In this way, the operation process is simplified; the bearing is not prone to damage; the work intensity is substantially reduced; and the operation is time-saving and labor-saving.