The invention discloses a full-bore multistage-key switch type fracturing slide sleeve. By adoption of the full-bore multistage-key switch type fracturing slide sleeve, the problems that existing slide sleeves are complex in structure and low in working reliability are solved. The full-bore multistage-key switch type fracturing slide sleeve specifically comprises a slide sleeve actuator and a slide sleeve switch mechanism. The slide sleeve actuator comprises a slide sleeve main body, an inner drum, a pressure adjustment piston, a base and a pulling rod. The slide sleeve switch mechanism comprises a throwing block body, a switch body, a clamping block, an outer slide block, an inner slide block, a slide block spring, a switch spring and an upper cap. According to the full-bore multistage-key switch type fracturing slide sleeve, the circumferential rotating angle of the inner drum is small in the opening process of the slide sleeve, the total rotating angle of the inner drum in the circumferential direction is zero degree after the slide sleeve is opened and closed each time, error superposition in the rotating process is avoided, the working reliability is improved, the recognition effect is good, opening and closing of slide sleeves in different stratums can be controlled by different switch mechanisms, multiple times of opening and closing of sleeves in one single stratum can be achieved, and the comprehensive performance of the slide sleeve is good.