A casement window driver, a sash of a casement window and a window frame profile are connected by a connecting rod sliding support, the drive includes: a connecting rod sliding support driving mechanism, which includes: a screw arranged in a profile cavity; And a threaded slider connected with the connecting rod slider on the connecting rod slide support; the first motor assembly, which is installed in the profile cavity and connected with the screw rod to drive the screw rod to rotate; the electric lock mechanism, which includes: fixed to the window sash A rack on the top; a gear provided at a position of the profile surface corresponding to the rack; a second motor assembly, which is installed in the profile cavity and connected to the gear to drive the gear to rotate. The flat window driver of the utility model has the advantages of simple and reasonable structure, convenient installation and maintenance, excellent sealing performance, safety and reliability, and low product cost. In addition, the driver can be built into the profile cavity, which does not affect the decoration effect of the house and improves the quality of the product. Finally, the utility model can be widely applied to various window components such as casement windows, transoms or skylights.

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