The utility model discloses a marine high tension cable lays bend radius measuring device, the device include four measuring sticks and a bolt and nut, the measuring stick includes first measurement piece, second measurement piece, third measurement piece, fourth measurement piece and the 5th measurement piece, first measurement piece, second measurement piece, third are measured piece, fourth measurement piece and the 5th measurement piece and are hollow wedge structure, the inside and outside inclination of wedge structure is unanimous, the 5th measures the piece cup joints in the piece is measured to the fourth, the fourth is measured the piece and is cup jointed in the piece is measured to the third, the third is measured the piece and is cup jointed in the piece is measured to the second, the second is measured the piece and is cup jointed in first measurement piece the first lower extreme of measuring the piece is equipped with a bolt hole, bolt and nut is connected four measuring sticks through the bolt hole, bolt and nut is the rotation axis of measuring stick. The utility model has the advantages of simple structure, convenient to use, accuracy height and application scope are wide.