Durable drilling pump

The invention relates to the technical field of drilling pumps, and is a durable drilling pump, which includes a pedestal and a frame; the pedestal is fixedly equipped with the frame, the frame is internally equipped with a crank shaft assembly, a pinion shaft, a connecting rod, a cross head, a guide plate and a central draw bar, a right part of the frame is provided with a hydraulic end assembly, two ends of the crank shaft assembly respectively have at least one main bearing bolt, two ends of the main bearing bolt are equipped with nuts via threads, and a side of the central draw bar close to the cross head is equipped with a central draw bar seal corrugated sleeve. The invention is rational and compact in structure and convenient in use, not only improves tightness of the central draw bar, but also avoids repair of the frame caused by the cracked main bearing bolt, so that operation maintenance, examination and repair of the pump are convenient, and service life of the pump is prolonged.