The invention discloses a front face submarine gate injection molding technology for a plastic part without a water gap material and a special device for the front face submarine gate injection molding technology. An opening of an injection molding nozzle creatively stretches into a die cavity and protrudes out of the die cavity, and in the injection molding process, the injection molding nozzle is inwards concaved below the plane of the plastic part. After injection molding is finished, due to the fact that the contact face of the opening of the injection molding nozzle and the plastic part does not protrude out of the surface of the plastic part, the protruding water gap material cannot be left on the surface of the plastic part, injection molding is conducted from the front face of the plastic part, and it is ensured that the plastic part can be closely attached to the plane and other structures. In addition, due to the fact that front face injection molding is selected, the injection molding speed can be greatly increased, the glue inflow can be greatly improved, the injection molding time can be effectively shortened, the production efficiency can be effectively improved, furthermore, the problems such as welding lines caused by slow glue inflow can be solved, and the strength of an injection molding piece structure is guaranteed. Due to the fact that the surface of an injection molding piece sinks, particularly the situation that residues on the surface of the plastic part affect product assembling can be avoided, and cracking of liquid crystal panels is avoided.