Anti-blocking device for casing window sidetrack drilling

The utility model discloses an anti-blocking device for casing windowing sidetrack drilling, which is used for casing blocking prevention, the side wall of a casing is provided with a side window through hole, and the anti-blocking device for casing windowing sidetrack drilling comprises a closed box, a power component, a transmission component and a spacer sleeve, the casing pipe is sleeved with the closed box in a closed mode, the power assembly is installed in a containing cavity formed by the closed box and the casing pipe, one end of the transmission assembly is in transmission connection with the power assembly, the other end of the transmission assembly is connected with the spacer sleeve, and the spacer sleeve is sleeved with the casing pipe and seals the side window through hole; a communicating hole is formed in the spacer sleeve, and the power assembly can drive the spacer sleeve to move to the position where the communicating hole is communicated with the side window through hole. The power assemb