The invention discloses a red grape cultivation room based on a PLC control. The cultivation room comprises a cultivation room main body; the cultivation room main body comprises a support and a plastic film; a PLC controller is arranged on the inner side of the cultivation room main body; plant growth lamps are arranged below the support; a steam boiler and a water tank are arranged on one side of the cultivation room body; a plurality of vent pipes are arranged below the bottom surface of the cultivation room body; and one end of each vent pipe is connected with the steam boiler and the water tank; the other end of each vent pipe is bent upwards and stretches out of the ground of the other side of the cultivation room main body; water outlet holes are formed below the vent pipe; the sizes of the water outlet holes increase gradually from one end of the each pipe to the other end; an air outlet is formed in the upper part of the cultivation room main body; and the steam boiler, the water tank and the plant growth lamps are connected with the PLC controller. The temperature and humidity inside the cultivation room can be intelligently controlled, solar illumination can be simulated, and the product quality can be improved.