The utility model discloses a polished rod calliper belongs to the oil field. Polished rod calliper includes: first calliper body (1), locate criss -cross second calliper body (2) with first calliper body (1) at intersect (A), an axle (3) that is used for locating movably at intersect (A) and connects first calliper body (1) and second calliper body (2), the preceding tip of first calliper body (1) is the arcuation, and the preceding tip of second calliper body (2) is the arcuation, be connected with first bracing piece (4) in the outside of first calliper body (1) preceding tip, and be connected with second bracing piece (5) in the outside of the preceding tip of second calliper body (2). The utility model discloses a set up first bracing piece and second bracing piece in the preceding tip outside of the preceding tip of first calliper body and second calliper body, play supporting role with packing pressure cap to packing gland, avoid that packing gland leads to the fact staff injured's circumstances with the easy landing of packing pressure cap in operation process.