Lock pin type rotary tillage ditcher

Disclosed is a lock pin type rotary tillage ditcher. The lock pin type rotary tillage ditcher comprises a three point suspension (5) and a center speed changing box (6) which are arranged on the upper side of a machine frame (20), wherein the center speed changing box (6) transmits power to a ditching mechanism power output shaft (13) and a rotary tillage mechanism power output shaft (15), one side of the center speed changing box (6) transmits the power to a rotary tillage mechanism (8) below the machine frame (20) through a side gearbox (7), the other side of the center speed changing box (6) transmits the power to a ditching mechanism (2) through a two stage speed reduction mechanism, the two stage speed reduction mechanism is composed of a primary speed reduction mechanism (11) and a secondary speed reduction mechanism (9), two lock pin mechanisms (12) which control the ditching mechanism (2) to rise and fall are symmetrically arranged on the rear side of the machine frame (20), and positioning holes opposite to the lock pin mechanisms (12) are formed in a ditcher support (3). By adopting the technical scheme, the lock pin type rotary tillage ditcher solves the problem that rotary tillage and ditching can only be simultaneously performed due to the fact that an existing rotary blade and an existing ditching tool are installed on the same shaft.