The utility model relates to an anti-interference device for arrester leakage current detection. Compared with the prior art, the defect that external stray capacitance of arresters interferes with arrester leakage current detection is solved. The anti-interference device comprises an arrester body (1), an on-line arrester monitor (5) and a current transformer (6), wherein the on-line arrester monitor (5) is connected with the current transformer (6). The anti-interference device further comprises a shielding ring (2). The shielding ring (2) sleeves the arrester body (1), the shielding ring (2) is arranged in a position which is 10cm above a tail-end umbrella skirt (7), and the shielding ring (2) is grounded through a shielding grounding wire (3). A grounding screw (8) of the arrester body (1) is connected with a grounding wire (4) which is grounded after passing through the current transformer (6). Leakage current generated by external stray capacitance of an arrester porcelain sleeve can be effectively shielded, and collected data is more accurate.