The invention discloses a combined roofing system of metal tiles and metal eave rafters. The combined roofing system comprises a metal pressing beam (1), the metal tiles (2), rafters (3), purlines (4), a waterproof board (5), a profiled steel plate (6), a supporting framework (7) and an eave rafter metal plate (8) which are arranged on a main body structure (10); embedded parts (9) are embedded inthe main body structure, the supporting framework is installed on the main body structure through the embedded parts, an upper inclined framework (72) is equipped with an adapter (74), the profiled steel plate is installed on the upper inclined framework through the adapter, the waterproof plate is installed on the profiled steel plate and a lower inclined framework; the purlines are connected with the adapter, the rafters are installed on the purlines, the metal tiles are installed on the rafters, and the metal pressing beam is installed on the top part of the supporting framework and connected with the metal pressing beam in a sealing manner; and the eave rafter metal plate is installed on the lower inclined framework. According to the combined roofing system of the metal tiles and themetal eave rafters, the fact that the whole roofing system has better stability and leakproofness can be ensured, the roofing weight can be reduced, and the hidden dangers of deformation of the waterproof board or falling off of the waterproof board and the adapter due to typhoon weather can be eliminated.