The invention relates to a process for obtaining plant-based drink from an oat material. The drink is prepared by steps that comprise providing an oat material, in which the lipase and beta-glucanase enzymes are prior inactivated, then mixing the oat material with an aqueous liquid in result of which an oat suspension is obtained. Next step is a filtration of the mixed oat suspension so that a filtrate and a fibre cake is obtained. Then the fibre cake is mixed with an aqueous liquid to produce a second suspension wherein after that the second suspension passes hydrolysis. Simultaneously extract beta glucan and protein and hydrolysed material is obtained. At least one hydrolase enzyme is added before or during hydrolysis. After hydrolysis the fibre is separated from the hydrolysed material, producing a clarified oat suspension.