The utility model discloses a GIS equipment density relay is with waterproof signal line connection terminal, including the connection terminal body with set up the grafting line hole on the connection terminal body, plug looks adaptation in the position in grafting line hole and the terminal box, its characterized in that: fixed being equipped with rather than making integrative ring cover is equipped with annular recess on the inside wall of ring cover on the all borders in the top of connection terminal body, the interior embedding top seal circle of recess, be equipped with annular recess on the top surface board of connection terminal body, embedding lower part sealing washer in the recess, the lower part sealing washer lies in between the ring cover inner wall and the grafting line hole outside. The utility model discloses the leakproofness is good, low cost, simple structure, sturdy and durable, when outdoor long-time running, prevents that the connection terminal humidity from intaking, uses safe and reliable, has guaranteed equipment normal operating.