The invention discloses a protocol conversion method and system based on SDK packages. The method comprises the following steps: encrypting target data through a preset SDK packet to obtain encrypteddata; the encrypted data and a preset number used for identifying the power equipment are sent to the mobile operation and maintenance platform, then the mobile operation and maintenance platform inquires a corresponding decryption secret key and a preset SDK decryption tool according to the preset number, and the encrypted data are decrypted according to the inquired decryption secret key and theSDK decryption tool. According to the method, protocol conversion is realized by packaging an SDK packet; the conversion between a power equipment protocol and a power grid specific protocol can be rapidly and conveniently realized; implementation mode is simple, when the communication protocol of the power equipment is changed, protocol conversion can be conveniently realized, conversion of heterogeneous protocols in a power system and a system networking process are simplified, so that the power equipment adopting the heterogeneous protocols can be converted into a power standard protocol to be networked with a mobile operation and maintenance platform, and the operation and maintenance efficiency of a power supply system is greatly improved.