Building vibration isolation layer construction joint located on rail transit line and construction method

The invention relates to the field of building construction, in particular to a building vibration isolation layer construction joint located on a rail transit line and a construction method. The building vibration isolation layer construction node is located above a rail traffic line, the building vibration isolation layer construction node comprises a first node, the first node comprises an upper column pier and a lower column pier, the upper column pier and the lower column pier are vertically opposite to each other and arranged at an interval, and a limiting wall is arranged between the upper column pier and the lower column pier and in the middle of the top face of the lower column pier; the top face of the limiting wall and the bottom face of the upper column pier are arranged in a spaced mode, vibration isolation support installation parts are arranged between the upper column pier and the lower column pier and on the left side and the right side of the limiting wall, and a vibration isolation support