Waterproof structure of expansion joint

The utility model discloses an expansion joint waterproof structure which is arranged on an expansion joint between concrete reverse ridges and comprises a first waterproof roll and a stainless steel water tank, the stainless steel water tank is in an inverted n shape, the two sides of the stainless steel water tank are installed on the tops of the concrete reverse ridges, and the middle of the stainless steel water tank is located in the expansion joint between the concrete reverse ridges. The two sides of the first waterproof roll are arranged on the top of the concrete reverse ridge and located above the stainless steel water tank, the middle of the first waterproof roll is in a V shape and extends towards the stainless steel water tank, a hole is formed in the bottom of the stainless steel water tank, and the downpipe is communicated below the hole. Through the arrangement of the waterproof coiled material and the stainless steel water tank, water seepage and water leakage are effectively prevented, and t