The invention discloses an arch rib segment construction platform. The arch rib segment construction platform comprises two groups of hanging brackets, a first cross beam, a second cross beam and a supporting platform, wherein the hanging brackets are arranged in a spaced manner; a supporting frame is arranged on each group of hanging brackets; the first cross beam is used for connecting the two groups of hanging brackets; a first group of ear plates is arranged on the first cross beam; the second cross beam is used for connecting the two groups of hanging brackets; the second cross beam and the first cross beam are arranged in a spaced manner; a second group of ear plates is arranged on the second cross beam; and moreover, the inclination angles of the first group of ear plates and the second group of ear plates are matched with that of the arch rib segment when the first group of ear plates and the second group of ear plates are connected with an arch rib segment; the supporting platform is arranged between the two supporting frames; the supporting platform comprises a first state and a second state; when the supporting platform is in the first state, the supporting platform is used for connecting the two supporting frames; and when the supporting platform is in the second state, a passage is formed between the two supporting frames. The construction working surface can be effectively guaranteed, and rapid mounting and detaching can be realized.