Tramcar plate beam and construction method thereof

The invention provides a construction method of a tramcar plate beam. The construction method includes the steps that firstly, the size of notches formed in a plate beam body is determined; secondly, twisted steel is bound, a formwork is fixed, space of the notches is reserved, and rail structure connecting steel bars need to be embedded in grooving positions; thirdly, concrete is poured to the twisted steel, the formwork and the rail structure connecting steel bars, prestressed bundles of bars are tensioned, the plate beam body is formed, and the two pairs of notches are formed in the plate beam body; fourthly, the twisted steel is bound into the notches, concrete is poured, and rail structures are laid, wherein the rail structures comprise rail bearing tables and rails arranged on the rail bearing tables; fifthly, a waterproof layer and a protective layer are sequentially laid on the plate beam body, and after the waterproof layer and the protective layer are laid, the top faces of the rails and the top face of the plate beam body are flush with the bridge floor of an existing highway bridge. The invention further discloses the tramcar plate beam.