The utility model discloses a pulley groove measuring caliper of a rolling pulley sheet. The pulley groove measuring caliper is characterized in that the caliper is provided with two same Z-shaped caliper plates (1), the two Z-shaped caliper plates (1) are arranged to intersected in an opposite mode, the centers of the two Z-shaped caliper plates (1) are fixed by pins (2), the Z-shaped caliper plates (1) can rotate around the pins (2), a measuring ruler (3) is fixed at the inner side of one end of one of the Z-shaped caliper plates, and the other ends, which are opposite to each other, of the two Z-shaped caliper plates (1) are pointed ends (4). The pulley groove measuring caliper provided by the utility model is simple and practical in structure, can detect the wearing conditions of the pulley groove of the rolling pulley sheet in an online mode, and is accurate in measuring.