This paper presents the design method and test results of a switchable dual-wavelength vertical-external-cavity surface-emitting laser （VECSEL）. The two lasing wavelengths with the separation of 50 nm are generated at different pumping powers using one single gain chip. During the operation of the VECSEL， the thermal rollover of output power is observed twice. The first rollover indicates the first switch of lasing wavelength， which is due to the temperature rise within the gain chip and its tuned gain spectrum. The maximum output power of each emitting wavelength exceeds 1.5W at 0°C. The lasing wavelength can be switched between 950 nm and 1000 nm with the change of pump power， and dual-wavelength emission with output power of more than1.5W is demonstrated. We believe that this kind of switchable dual-wavelength VECSEL device has great application potential as dual-wavelength laser sources for providing technical support for mid-infrared radiation.