The invention discloses a device for mobile phone flash lamp lighting. The device comprises a light cup for reflecting and gathering light, a fixing support integrated with the light cup and a pasting belt for fixing the light cup on a mobile phone, the two ends of the fixing support are provided with grooves which are connected with the pasting belt, a light through hole is formed in the middle of the position where the light cup is connected with the fixing support, and the shape and the size of the light through hole correspond to the shape and the size of a flash lamp on the back face of the mobile phone. The device is quite convenient to use, and can serve as a small accessory of the mobile phone to be carried when the device is not used. When the device is used, the device is only required to be fixed on the mobile phone with the pasting belt, the mobile phone flash lamp and the device are integrated, the lighting effect of the mobile phone flash lamp is greatly improved, each beam of light is reasonably gathered, the energy of a power source is sufficiently used.