The invention discloses a maintenance channel fixing clamp of a fiber reinforced plastic grating plate of a colored steel tile roofing. The maintenance channel fixing clamp comprises a first clampingblock, a second clamping block, a supporting plate, a cover plate and a fixing piece, and the first clamping block is provided with a fixing groove and a first clamping part; the second clamping blockis provided with a fixing tooth matched with the fixing groove and a second clamping part matched with the first clamping part; the supporting plate is horizontally arranged on the top of the first clamping block or the second clamping block, and when the first clamping block and the second clamping block are matched in a clamped mode, the supporting plate is located on the top of a matching structure; the cover plate and the supporting plate are connected and matched so as to tightly clamp and fix the fiber reinforced plastic grating plate; and the first clamping block and the second clamping block are connected and fixed into a whole through the fixing piece. According to the provided scheme, the unique clamp form is utilized, the situation that a fiber reinforced plastic walkway is fixed to a tile fillet is achieved on a colored steel tile fillet of an original roofing, the original roofing structure is not destroyed, the suspension length of the grating plate is shortened, and thestability degree is improved; and meanwhile, the cost is further reduced, and the mounting efficiency is improved.