The utility model relates to a floor structure of a sports venue, which belongs to the technical field of floor paving and comprises transverse keels, longitudinal keels and floors, the transverse keels are linearly arranged and paved on a foundation, the longitudinal keels are linearly arranged and crossly paved on the transverse keels, accommodating grooves are formed in the bottoms of the floors, and the accommodating grooves are communicated with the longitudinal keels. Positioning blocks are rotationally connected into the containing grooves, positioning grooves are correspondingly formed in the upper surfaces of the longitudinal keels, and the positioning blocks are clamped into the positioning grooves. Through the matched design of the transverse keels, the longitudinal keels, the positioning blocks and the positioning grooves, the transverse keels and the longitudinal keels are installed on the foundation through the expansion bolts, the positioning blocks are inserted into the positioning grooves in the longitudinal keels, positioning of the floor is completed, and when replacement is needed, the floor is sucked through the suction cups and pulled upwards, and the floor can be replaced. And the positioning blocks and the positioning grooves are separated, so that the floor is taken down and replaced with a new floor, surrounding floors are not affected, replacement is convenient, the working efficiency is improved, and the practicability is enhanced.