The invention provides a polyoxyethylene based electrolyte, a preparation method and application thereof. The polyoxyethylene based electrolyte has the chemical structural formula shown by formula I, wherein each Ar is respectively a phenyl group or a phenyl group substituted by a sulfonic acid group, the substitution rate of the sulfonic acid groups in all the Ar is 1/36-1/12, and eac sulfonic acid group is -SO3H<->M<+>, and M<+> is a halogen ion or a metal cation; R1 is an alkoxy group with C1-C10; and R2 is an alkyl group with C1-C4, n is an integer of 10-800, m is an integer of 8-44, and x is 0.1-0.8. A solid electrolyte film comprising the polyoxyethylene based electrolyte has good mechanical property, good electrical property and high lithium-ion ionic conductivity.