The invention discloses a vehicular accumulator with an antitheft function. The vehicular accumulator with the antitheft function comprises an accumulator shell and a storage battery, wherein the storage battery and a controller are arranged in the accumulator shell; a power anode outputting wiring terminal and a power cathode outputting wiring terminal are arranged at one end of the upper portionof the accumulator shell; a groove is formed in the middle of the upper plane of the accumulator shell; a plurality of reed pipes which are connected in series are arranged on the bottom of the groove; a cover plate which is connected with the groove in a plugging and unplugging cooperation manner is arranged in the groove; a plurality of permanent magnets are arranged in the cover plate; and thestorage battery, the reed pipes, the power anode outputting wiring terminal and the power cathode outputting wiring terminal are separately connected with the controller electrically. The vehicular accumulator with the antitheft function is reasonable in design, simple in structure, reliable in action and high in practicality. The normally closed reed pipes and the normally open reed pipes are separately provided with cover plate structures corresponding to the permanent magnets, a working mode of triggering triodes by passwords is obtained, if a person takes away corresponding cover plates to obtain the accumulator of the electric bicycle without permission, the accumulator cannot be used, and the antitheft effect is achieved effectively.