T roof beam precasting yard that sets up on having longitudinal gradient's road bed includes that the reinforcing bar adds the builder's temporary shed, sets up the prefabricated pedestal of T roof beam and deposit liang qu on longitudinal gradient, the reinforcing bar adds the builder's temporary shed and establishes in the originated mileage section in T roof beam precasting yard place, the originated mileage section in place terminates the middle prefabricated pedestal of T roof beam that is equipped with of mileage section with the place, place termination mileage section is equipped with deposits liang qu. Through set up T roof beam precasting yard at the longitudinal gradient road bed, reduced the harmonious degree of difficulty and the expropriation of land expense of T roof beam precasting yard, the construction and the transportation of the T roof beam of being convenient for possess very strong popularization nature, and the collection and the drainage of the maintenance water of being convenient for simultaneously are unobstructed, the utility model also discloses a T roof beam precasting yard that sets up on having longitudinal gradient's road bed construction method.