A tandem full-field optical coherence tomography (FF-OCT) system based on compensation interferometer is proposed. The new system consists of a common-path detection interferometer and a double-armed compensation interferometer. The former is used to detect the backscattered light from the sample, and the latter is used to compensate the optical path difference of two arms of the detection interferometer. A broadband halogen light source and a large numerical aperture microscopic objective are used for imaging. When the phase is modulated by a single chip-based control device, en-face tomography images of samples are obtained from the interference images. The experiment of optical tomography imaging for onion cells is conducted to demonstrate the feasibility of the proposed system. The detection interferometer based on the common-path structure has a small size and it is not sensitive to external environment. The handheld detection interferometer can be achieved when we use a fiber to connect two interferometers, and it has great importance in achieving endoscopic probes.