The invention discloses an electrolyte containing lithium phosphonide. The electrolyte containing lithium phosphonide comprises conductive lithium salt, a non-aqueous organic solvent and an additive,wherein the additive comprises lithium fluorophosphorimide, and the structural general formula of lithium fluorophosphate is as shown in the formulae (I) and (II), wherein the formula (I) is lithium difluorophosphoryl sulfonamide; the formula (II) is difluorophosphoryl pentafluorophosphoronitrile lithium; R1, R2, R3, R4 and R5 are H, CxHy, CN, F and CxFyHz, x is equal to 1 to 6, y is equal to 1 to15, and z is equal to 1 to 15. In the electrolyte of the invention, due to strong electron-withdrawing effects and electron shielding effects of phosphoryl (sulfonyl) groups, anions have negative charge dispersion and good structural flexibility and exhibit weak coordination properties, to effectively improve the conductivity, dissociation constants, and the lithium ion transference number of theelectrolyte; and lithium phosphoimide with a weak coordination structure has good solubility in the organic solvent and overcomes the disadvantages of poor solubility of widely used lithium difluorophosphate.