provided are a conjugated polymer containing ethynyl crosslinking group , mixture , formulation , organic electronic device containing the same and application thereof . the conjugated polymer material has a conjugated main chain structure and an ethynyl crosslinking group as a functional side chain . the conjugated polymer material produces an insoluble and unmeltable crosslinked interpenetrating network polymer film under heating , has excellent solvent - resistance , and is suitable for manufacturing a complex multi - layer organic electronic device . the conjugated polymer can be applied in optoelectronic devices such as an organic field effect transistor , an organic light emitting diode , a polymer solar cell , a perovskite solar cell , etc , and improves device performance .