AbstractTwo-dimensional magnetic semiconductors provide a platform for studying physical phenomena at atomically thin limit, and promise magneto-optoelectronic devices application. Here, we report light helicity detectors based on graphene-CrI₃-graphene vdW heterostructures. We investigate the circularly polarized light excited current and reflective magnetic circular dichroism (RMCD) under various magnetic fields in both monolayer and multilayer CrI₃ devices. The devices exhibit clear helicity-selective photoresponse behavior determined by the magnetic state of CrI₃. We also find abnormal negative photocurrents at higher bias in both monolayer and multilayer CrI₃. A possible explanation is proposed for this phenomenon. Our work reveals the interplay between magnetic and optoelectronic properties in CrI₃ and paves the way to developing spin-optoelectronic devices.