Method and device for measuring curvature radius of lens by use of laser

The invention discloses a method for measuring the curvature radius of a lens by use of laser. The method uses a device and comprises the following steps: horizontally placing a planoconvex lens to be measured on the edge of a groove with round inside of a mounting seat; reflecting the laser by a reflector and vertically emitting the laser onto the planoconvex lens to be measured, wherein two light beams reflected by the upper and lower surfaces of the planoconvex lens to be measured are coherent lights and form an interference Newton's ring; measuring the dark ring level k of interference fringes through a reading microscope, and measuring the diameter corresponding to the kth level dark ring at the same time; assigning k+1, k+2, k+3,..., and multiple dark rings to k through a multi-measurement method, and measuring the diameter value of corresponding dark rings; processing data by a successive difference method, and measuring the diameter values of k+m+1, k+m+2, k+m+3,... and multiple dark rings at the same