In this work, a highly efficient face detection and face occlusion system with Symmetric Mask-based Discrete Wavelet Transform (SMDWT) and facial condition Look-up-Table (LUT) is proposed. It uses a low resolution image and the LUT to improve the face detection system to achieve real-time processing, and also adopts the wavelet face feature detection method to increase correction ratio. Our approach has been verified on captured images under various real indoor environments. As a result, it can provide a higher correction rate in the detection of multiple faces for real-time face detection applications.