The invention discloses a sucker measuring tape. The sucker measuring tape comprises a measuring tape body capable of being bent freely and a box body for containing the measuring tape body. A sucker is arranged on the end portion of the measuring tape body, and a button used for automatically retracting the measuring tape body is arranged on the box body. The sucker measuring tape has the advantages that because the measuring tape body is fixed to the initial position through the sucker, the measuring tape body can be bent freely, a non-planar object with curvature or non-planar distance with curvature can be measured conveniently, the measurement result is accurate and reliable and can be displayed automatically.