In order to study the mechanical properties of waste fiber recycled concrete slab, 5 pieces of slab specimens were made. The design variables were the replacement ratio of recycled aggregates and the volume of waste fibers. The load tests were carried out by simulated uniform load. The failure process and the strain and deflection of the waste fiber recycled concrete slabs were observed. The test results show that the loading capacity of the specimen is reduced by the addition of recycled coarse aggregates, but it can be improved effectively by adding waste fibers, and the volume of the optimal waste fibers is 0.12%. A formula for calculating the bearing capacity of waste fiber recycled concrete slabs was put forward. The calculation results coincide well with the test results.