Aiming at how to reduce or even eliminate the chattering phenomenon common in the unmanned underwater vehicle(UUV) control, a new attitude control scheme (fuzzy variable structure control) is proposed. By transforming the switching term of the variable structure into the fuzzy control output, establish UUV vertical motion model, design controller, and carry out example simulation and analysis. The simulation results show that the proposed control scheme can effectively suppress chattering and obtain excellent tracking steady state. Moreover, it has strong robustness to the uncertainty of the UUV model and its parameter changes.