A reinforced long spiral rock-socketed construction device is composed of a reinforced rack, a power system, a drilling system and a cooling system. The reinforced rack comprises a control console and a pile frame. The special power system comprises a power head, an oil pressure delivery pipe and a power station. The power station is mounted on a lower end platform of the pile frame. The power head is mounted on a pile frame sliding rail. The pile frame can meet the requirements for stability and strength of the power system under the rated large torque working condition. The drilling system comprises a reinforced drilling rod, a special drill bit and a multifunctional flange plate. The top of the reinforced drilling rod is connected with the power head and the cooling system through the multifunctional flange plate. The bottom of the reinforced drilling rod is connected with the special drill bit. The cooling system is composed of a grouting pump, a grouting pipe, a connection welded pipe and a spray nozzle. The connection welded pipe is attached to the reinforced drilling rod. The lower end of the connection welded pipe is connected with the spray nozzle mounted at the position of the special drill bit. The reinforced long spiral rock-socketed construction device is high in drilling capacity and wide in application range, the problems that a long spiral drilling machine cannot drill and gets stuck in a dense gravel soil layer with a large particle size and a weathered rock formation are solved, and a basis is laid for wide application of long spiral drilling and pressure pile grouting.