The invention relates to an electronic current transformer on-line checking system based on a double-clamp current coil, comprising a checking platform which consists of a high-voltage side standard channel current transformer, a low-voltage side receiving end and an upper computer; the high-voltage side standard channel current transformer is connected with the low-voltage side receiving end through wireless transmission; the low-voltage side receiving end is connected with the upper computer through a serial signal connecting wire; and the low-voltage side receiving end is connected with an electronic current transformer to be checked through a connecting lead or an optical fiber. The electronic current transformer on-line checking system based on the double-clamp current coil judges if the installation of a standard channel current sensor meets relevant requirements through the mutual checking of two clamp current coils, so that the checking data feedback judgment of a standard current channel is formed, the controllability of on-site operation is ensured, and the high-precision electronic transformer on-line checking is realized. Simultaneously, the electronic current transformer on-line checking system based on the double-clamp current coil is based on an open frequency band wireless transmission data technology between a high-voltage side and a low-voltage side, so that a heavy optical fiber synthesizing insulator is omitted, and the on-site operation difficulty is greatly reduced.