The utility model discloses an antifouling mud foot rest device of transformer substation's interval construction has solved the poor problem of reliability and commonality of foot rest device, and the technical scheme that solves this problem mainly includes skeleton, backup pad and support base, the support base is equipped with the fixed part on locating the skeleton in the backup pad, be equipped with the fixed pin on the fixed part, is equipped with the bolt hole on the skeleton, the backup pad is fixed in the skeleton when the fixed pin inserts the bolt hole on. The utility model discloses a foot rest device not only does benefit to the constructor sharp work, builds the convenience moreover.