The invention belongs to the technical field of model tests, and particularly relates to an engineering structure ice-collision transverse ice load loading device and method. Through the arrangement of the ice tank, the lifting system and the model power system, the actual condition when a structure collides ice can be well simulated, and when the ice tank is in a horizontal state, water injection ice making is performed layer by layer, so that air holes can be prevented from occurring in an ice layer; considering the real condition of collision between a structure and ice, two ends of the ice groove need to be opened, so that when the model collides to the ice surface at a certain speed, the ice surface at the other end has no constraint; different speeds are provided for the test model through the flat car, the flat car is provided with the adjustable clamp used for fixing the model, model tests of different scales can be provided, the real collision condition of a structure and ice can be well simulated, the structure is simple, cost is saved, and use is convenient.