Horizontal well staged fracturing device and method

The invention belongs to the field of petroleum exploration and development, and particularly relates to a horizontal well staged fracturing device and method. The device comprises a detonation fracturing assembly, a pitching slide sleeve assembly and an ignition connector, wherein the ignition connector is arranged between the detonation fracturing assembly and the pitching slide sleeve assembly, and an ignition assembly is arranged inside the ignition connector. When the device is used, water with a certain magnitude of pressure is injected into the device, the ignition assembly is made to detonate the detonation fracturing assembly, presplitting grains are formed in an underground stratum, then, water is injected into the device again, water acts on the underground stratum through water outlet holes in the pitching slide sleeve assembly, and therefore final grains are formed. The horizontal well staged fracturing device and method are simple in structure and easy to operate, and the quality of borehole operation is greatly improved.