A plate-shaped forecasting method suitable for an eight-roller cold-rolling unit mainly comprises the following computer-executed steps that 1, eight-roller rolling unit device parameters, characteristic parameters of a to-be-rolled typical strip and corresponding rolling technological parameters are collected; 2, unit partition and coefficient solution are conducted; 3, a strip front tension transverse distribution value during rolling is forecasted; and 4, plate-shaped distribution of a strip outlet during rolling is forecasted. According to the plate-shaped forecasting method, the plate-shaped distribution of the strip outlet can be quantitatively forecasted under the influence factors such as working roller bending force, working roller channeling, front tension, rear tension, the roller inclining quantity and different roller types; and a guide effect is acted on on-site strip steel production, large economic benefits are brought to enterprises, and further application and popularization value is achieved.