The invention discloses a screen recording device comprising an acquisition board, a synthesized board, an encoding compression board and a file writing module. The acquisition board comprises a computer video acquisition module, a camera video acquisition module, a computer audio acquisition module and a microphone audio acquisition module. Each acquisition module is realized by independent hardware, and needs not to occupy a CPU (Central Processing unit), so the acquisition frame rate is not limited by the processing speed of the CPU, the dynamic video and the transparent pictures can be captured, and the computer voice and the microphone voice can be recorded simultaneously. In comparison with recording just by software, the recording effect is improved, and the recording efficiency is increased.