The invention discloses a split type double-cylinder pump. A base of the split type double-cylinder pump is connected with a gas outlet tube; the lower end of the base is connected with a gas storagecylinder which is in detachment fit with the base; a piston type pump assembly mainly including a piston cylinder is arranged at the upper end of the base; a gas inlet channel is arranged on the base;a check valve is arranged in the gas inlet channel; a valve core which is in rotation fit with the base is arranged on the base; switching of states is carried out by rotating the valve core; when the pump is in an inflating state, the piston cylinder communicates with the gas outlet tube through an inflating hole and a central hole of the valve core; when the pump is in a gas storage state, thepiston cylinder communicates with the gas storage cylinder through a gas storage hole of the valve core; when the pump deflates under high pressure, after the piston cylinder communicates with the gasoutlet tube through a gas outlet hole and the center hole of the valve core; and after the gas storage cylinder is detached, the base is landed and is used as a foundation, and the valve core is rotated and switched to the inflating state, so that the inflation can be normally carried out. The split type double-cylinder pump has the advantages that the structure of the pump is reasonable, and a demand of supplementing gas to common tyres and vacuum tyres can be met; and by detaching the gas storage cylinder, the height is adjusted, and the split type double-cylinder pump is convenient to store and carry.