The invention relates to the technical field of oil reservoir productivity prediction, in particular to a prediction method for volcanic rock oil reservoir productivity. The prediction method comprises the following steps: step one, collecting the oil reservoir basic parameters of oil reservoirs or similar oil reservoirs of tested oil wells in target blocks, including individual well productivity Q, perforation reservoir thickness h, crude oil volume factor B0, comprehensive skin factor s, perforation productivity ratio PR, starting pressure gradient lambda, after-pressing well testing permeability Ks, formation pressure pe, flowing pressure pw, wellbore radius rw, fluid viscosity u, and fracturing fracture length, wherein the unit of the after-pressing well testing permeability Ks is mD, the units of the formation pressure Pe and the flowing pressure Pw are MPa, the unit of the wellbore radius rw is m, and the unit of the fluid viscosity u is MPa*s. Compared with an existing analogy method, the prediction method is more targeted, and the precision is higher, the precision can be improved to 60% above through the method disclosed by the invention, and a good method is provided for exploration oil testing, layer selection and the like.