The invention relates to a fiber processing system for opening and mixing fiber material, with a multiple number of bale openers (2) for opening fiber bales (FB) and conveying devices (4a, 4b; 14a, 14b) downstream of the bale openers (2) for mixing and conveying the opened fiber material to a downstream processing device (10), for example a mixing chamber or a carding feed. The device in accordance with the invention is characterized in that the bale openers (2) are divided into at least two opener groups (3a, 3b; 13a, 13b), each of which produces a fiber mixture (M1, M2), and that each opener group (3a, 3b; 13a, 13b) is allocated with a conveying device (4a, 4b; 14a, 14b), whereas the conveying devices (4a, 4b; 14a, 14b) are designed and arranged in such a manner that the respective fiber mixture (M1, M2) is transported away in relation to the associated opener group (3a, 3b; 13a, 13b) in different directions (R1, R2; R1, R2) and the fiber mixtures (M1, M2) are combined before or in the processing device (10) into an overall fiber mixture (GM). Likewise, the invention relates to a method for opening and mixing fiber material in a fiber processing system.