The invention provides a method for manufacturing a multi-curved surface lens light distribution device. A multi-curved surface lens of an axisymmetric structure composed of eight curved surfaces is designed and manufactured to serve as the light distribution device to conduct light distribution on an LED street lamp, so that a rectangular lighting light spot is obtained. The method for manufacturing the multi-curved surface lens light distribution device is characterized by comprising the following steps that step 1, the length L, width D and height H of the multi-curved surface lens and the installing height h of the LED street lamp are determined primarily; step 2, the cross section of the multi-curved surface composed of eight curved lines is designed through the SolidWorks and the structural parameter of the cross section is obtained; steps 3, the cross section is stretched longitudinally to be at the length L to obtain a complete multi-curved surface lens model; step 4, the multi-curved surface lens model is induced to optical design software Lighttools, stimulation optimization is conducted, and the optimized structural parameter of the multi-curved surface lens light distribution device is obtained; step 5, the multi-curved surface lens light distribution device is manufactured according to the optimized structural parameter of the multi-curved surface lens light distribution device.