Method for preparing wide titanium alloy plate by adopting titanium-steel combined mode

The invention provides a method for preparing a wide titanium alloy plate by adopting a titanium-steel combined mode. The method comprises the following steps: S1, manufacturing a steel-titanium coating structure; s2, heating, hot rolling and hot straightening processes are sequentially conducted on the steel titanium coating structure, and a pre-finished product is obtained; and S3, performing post-treatment on the pre-finished product to obtain a target product. Through the steel-titanium coating structure, the titanium alloy composition plate is prevented from being in direct contact with air and a roller in the hot rolling process, so that the problem of surface cracks caused by sharp increase of deformation resistance of a titanium alloy material due to too fast temperature drop is solved; and the possibility that a thick oxide layer is generated on the contact surface of the titanium alloy composition plate and the atmosphere is also reduced. The titanium alloy composition plate is coated with the upper