Crankshaft for drilling pump

The invention relates to the technical field of crankshafts, in particular to a drilling pump crankshaft which comprises a drilling pump, a connecting assembly is mounted on the right side of the drilling pump, a flywheel is mounted on the right side of the connecting assembly, a self-lubricating assembly and an extension assembly are mounted on the outer wall of the flywheel, and the connecting assembly comprises a connecting cylinder, a first groove, a first bolt, a first connecting column, an inserting groove and an inserting rod. The connecting cylinder is installed at the output end of the drilling pump, and the first groove is formed in the front face of the connecting cylinder. According to the crankshaft for the drilling pump, the first bolt is rotated through an instrument and taken down, the inserting rod can be taken out from the interior of the inserting groove in a sliding mode, and therefore the whole crankshaft is taken out and replaced, operation is easy and convenient, when the crankshaft is