The utility model discloses a half high layer suspended insulation maintenance gap bridge which comprises two groups of support frames, four long rods in each group of support frames define a vertical square frame, then all short rods are locked on the four long rods through frame buckles, a platform is glidingly erected on upper middle parts of two support frames and placed on two short rods, located on the same plane, of each support frame and formed by a platform board and a platform support, telescopic guide rails are arranged at the upper parts of the support frames, the bridge further comprises guard rail cross bars which connect the guard rails above the two support frames, the guard rail cross bars and the guard rails form an enclosure structure, and a high and low stool is further arranged on the platform of the half high layer suspended insulation maintenance gap bridge. The half high layer suspended insulation maintenance gap bridge has the characteristics that the bridge can be detached, and the assembly is easy, the unnecessary difficulty caused by middle obstacles which cannot be crossed during working is reduced, the working efficiency and the safety factor are improved, and the labor intensity of a worker is reduced.