The invention discloses a controllable inner decoration coater comprising a base. Blocking frames are arranged on the two sides of the upper surface of the base correspondingly; a pressurizing device is arranged on the upper surface of the blocking frame on one side, and a controller is arranged on the upper surface of the blocking frame on the other side; a material storage barrel is arranged between the blocking frames; a motor is arranged at one end of the material storage barrel; a stirring frame is arranged in an inner cavity of the material storage barrel; an output shaft of the motor penetrates through the material storage barrel to be in transmission connection with the stirring frame; a connecting pipe is arranged at the other end of the material storage barrel; and a spraying nozzle is arranged at the top end of the connecting pipe. According to the controllable inner decoration coater, manual smearing is replaced with the spraying nozzle; a flow sensor is arranged in a liquid injecting opening, so that the using amount at every time can be measured, and budgeting is facilitated; meanwhile, uniform smearing can be conducted; coating can be effectively controlled, so that coating wasting is avoided; and labor is replaced with machinery, so that the smearing speed is improved, and the required time of decoration is shortened.