Preparation of high-quality films plays an important role to achieve high-performance nonfullerene (NF) organic solar cells.NF active layer films are typically fabricated by spin coating.Novel fabrication methods to process the NF active layer are desirable to be compatible with large-area production.Herein,we report on the fabrication of NF active layer films via a water transfer printing method.This method delivers a uniform film with controllable film thicknesses.NF active layers of PDBD-T:ITIC and PBDB-T-2F:IT-4F were fabricated via the method to validate its effectiveness.Solar cells with the water transfer-printed active layers show comparable performance (up to 11.7％) to the cells with spin-coated active layers.Furthermore,NF solar modules containing 4-sub cells with the active area of 3.2 cm2 are also fabricated via the method.The module shows Voc of up to 3.4V and a power conversion efficiency of 8.1％ with the PBDB-T-2F:IT-4F active layer.