The invention discloses a power grid new energy consumption capability evaluation calculation method, device and system based on a multi-scene generation technology, and the method comprises the steps: determining a power grid range and a calculation period of power grid new energy consumption capability evaluation calculation needing to be carried out, and other calculation boundaries; generatinga large number of combined scenes containing multiple new energy power plants through free permutation and combination among the fields; adopting a scene reduction technology of a backward reductionmethod, merging similar scenes, reducing the number of combined scenes, and generating typical combined scenes; carrying out the similar time period merging analysis, and reducing the number of time periods entering optimization; for each typical combination scene, establishing an SCUC dimension reduction model after time period merging, and solving to obtain a unit combination result; establishing an all-time SCED model based on the unit combination result and solving, and finally obtaining a new energy consumption result under each typical combination scene, thereby finishing power grid newenergy consumption capability evaluation calculation based on a multi-scene generation technology. According to the invention, on the premise of ensuring the safety and stability of the system, the effectiveness and referenceability of the consumption capability evaluation result are improved.