The utility model discloses a big section tunnel limit roof arch concrete maintenance platform truck aims at providing the big section tunnel limit roof arch concrete maintenance platform truck that the wet curing homogeneity is good. It includes base, running gear, support body, water jet equipment and manger plate canopy, the base includes two parallel arrangement's shaped steel, the support body is installed on the shaped steel of base, and the lower part of support body is left along tunnel length direction and is bought car in installments and passageway that the pedestrian passes through, running gear is including installing in the walking wheel of base lower extreme, water jet equipment includes that many set up side by side on the support body, corresponding with tunnel limit roof arch shape and have a water spray person in charge of inlet tube along tunnel length direction to and a plurality of spray pipes that just export on the water spray is responsible for towards tunnel limit roof arch that set up according to certain form, the manger plate canopy is fixed to be set up in support body upper portion and is located water spray person in charge below. The utility model discloses greatly the reduction personnel drop into, effectively reduce constructor's intensity of labour.