All-polymer　solar　cells　(all-PSCs)　are　the　most　promising　power　generators　for　flexible　and　portable　devices　due　to　excellent　morphology　stability　and　outstanding　mechanical　property.　Previous　work　indicates　high　crystallinity　is　beneficial　to　device　performance　but　detrimental　to　mechanical　property,　therefore　identifying　the　optimized　ratio　between　crystalline　and　amorphous　domains　becomes　important.　In　this　work,　we　demonstrated　highly　efficient　and　mechanically　robust　all-PSCs　by　blade-coating　technology　in　ambient　environment　based　on　PTzBI:N2200　system.　By　controlling　the　aggregation　in　solution　state　and　ultrafast　film　formation　process,　a　weakly　ordered　molecular　packing　morphology　as　well　as　small　phase　separation　is　obtained,　which　leads　to　not　only　the　good　photovoltaic　performance　(8.36%-one　of　the　best　blade-cast　device　in　air)　but　also　prominent　mechanical　characteristic.　The　controlled　film　shows　a　remarkable　elongation　with　the　crack　onset　strain　of　15.6%,　which　is　the　highest　result　in　organic　solar　cells　without　adding　elastomers.　These　observations　indicate　the　great　promise　of　the　developed　all-PSCs　for　practical　applications　toward　large-area　processing　technology.