The present invention belongs to the technical field of ballastless track bridge kerbstone cast-in-situ construction of the passenger dedicated lines and the high-speed railway, and particularly relates to a railway ballastless track bridge kerbstone cast-in-situ construction method. The invention settles the problems of difficult installation, affected bridge appearance and high transportation cost which are likely caused by the prior kerbstone prefabrication construction method. The invention uses a ballastless embedded steel plate on a beam body flange plate, an anti-collision wall and the embedded reinforcement on the ballastless track base for installing the kerbstone cast-in-situ bracket and the formwork system. The railway ballastless track bridge kerbstone cast-in-situ construction method of the invention has the following benefits: effectively used self structure of the beam body as a supporting bearing system, light bracket, reasonable structure, definite bearing, convenient disassembly and assembly, short construction circulation period, and realized safe and quick construction of the kerbstone. Compared with the prefabrication method, the railway ballastless track bridge kerbstone cast-in-situ construction method of the invention has the advantages of keeping the characteristic of disassembly capacity of the kerbstone, increasing the compatibility and compactness of the connection between the kerbstone and the beam body; saving the processes of specially prefabricating the ground and hoisting the product, and simplifying the intermediate transportation link.