Casing sliding sleeve separate layer fracturing pipe column free of depth correction well completion and fracturing method

The invention discloses a casing sliding sleeve separate layer fracturing pipe column free of depth correction well completion, which comprises a plurality of layers of pipe column units which are sequentially connected end to end, each layer of pipe column unit comprises a casing, the top end of the casing is coaxially connected with a sliding sleeve, an inner core cylinder is arranged in the sliding sleeve in a sliding fit manner, and a fracturing channel is formed in the side wall of the sliding sleeve corresponding to the inner core cylinder. And the bottom end of the sleeve is coaxially connected with a secondary ball receiving cylinder of which the inner diameter is smaller than that of the inner core cylinder. The invention further discloses a casing sliding sleeve separate layer fracturing method free of depth correction well completion. According to the casing sliding sleeve separate-layer fracturing pipe column for well completion free of depth correction and the fracturing method, the operation mod