A product sealing performance detection auxiliary device provided by the present invention is characterized by detecting the connection sealing performance between a product main body and a flexible body fixedly connected with the product main body, and comprising a supporting body, an angle adjusting member rotatably arranged on the supporting body, a clamping member configured to clamp the product main body and a force applying member fixedly connected with the flexible body to apply a tractive force on the flexible body, wherein the angle adjusting member is equipped with at least two fixing positions capable of fixing relative to the supporting body in a rotation circumferential direction, the clamping member is positioned relative to the angle adjusting member to enable the clamping member to rotate along with the rotation of the angle adjusting member, and the direction of the tractive force is not parallel with the rotation axis of the angle adjusting member. The product sealing performance detection auxiliary device of the present invention can simulate the actual usage state of a product during the product sealing performance detection, and enables the product sealing performance detection reliability to be improved.