Self-energized gas-liquid multi-stage separation device for coal bed gas horizontal well

The invention relates to the technical field of gas-liquid separation, in particular to a self-powered gas-liquid multi-stage separation device for a coal bed gas horizontal well. Comprising an upper box body, an upper cavity is formed in the upper box body, an upper air outlet pipe is fixed to the upper end of the upper box body and communicated with the upper cavity, a right-angle baffle is fixed in the upper cavity, an inlet pipe is fixed to the upper box body and communicated with the upper cavity, and a gas-liquid mixture discharged from the inlet pipe enters the upper cavity after impacting a vertical part of the right-angle baffle; a lower box body is fixed at the lower end of the upper box body, the lower box body is provided with a lower cavity, the upper cavity is communicated with the lower cavity, a lower liquid outlet pipe is fixed at the lower end of the lower box body, the lower liquid outlet pipe is communicated with the lower cavity, a lower air outlet pipe is fixed at the upper end of the lo