Polymer electrolyte and preparation method and application thereof

The invention provides a polymer electrolyte and a preparation method and application thereof, the polymer electrolyte comprises a polymer and an electrolyte salt, the polymer comprises a first structural unit # imgabs0 # and a second structural unit # imgabs1 #, and R1, R2, R3, R4, R5 and R6 are the same or different polyether groups. The polymer electrolyte provided by the invention has high mechanical property and excellent ionic conductivity, and is beneficial to improving the cycle performance and structural reliability of the battery.