Comprehensive pipe rack ventilation pavilion anti-flooding device

The utility model provides a utility tunnel ventilation pavilion flood prevention device which comprises a ventilation pavilion base and a waterproof membrane, the ventilation pavilion base is fixedly arranged on a ventilation pavilion in a sleeved mode, one end of the waterproof membrane is fixedly connected to the ventilation pavilion base, and the other end of the waterproof membrane is fixedly connected with a supporting assembly. The ventilation pavilion comprises a ventilation pavilion base, a plurality of first open grooves are formed in the outer side face of the ventilation pavilion base, lifting assemblies are arranged in the first open grooves, each lifting assembly comprises a first sliding block, and the first sliding blocks are slidably connected with the first open grooves. According to the scheme, the lifting assembly which is in sliding connection with the first open groove and is driven by the buoyancy driving device to ascend and descend is arranged on the ventilation pavilion base, the lif