Plastic insertion type end plug of ball screw pair

The invention discloses a plastic insertion type end plug of a ball screw pair. The plastic insertion type end plug comprises a first end plug (1) and a second end plug (5), wherein the first end plug (1) and the second end plug (5) are mutually inserted to form the insertion type end plug; an upper semicircular groove (2) is formed in the first end plug (1); a lower semicircular groove (6) is formed in the second end plug (5); the first end plug (1) and the second end plug (5) are mutually inserted to form a circular reverse ball return channel (M); an inlet of the reverse ball return channel is a circular inlet; insertion devices are arranged on the first end plug and the second end plug, and enable the first end plug and the second end plug to be mutually inserted and tightly connected; and the first end plug and the second end plug are manufactured by Dupont glass reinforced nylon materials. The plastic insertion type end plug has the beneficial effects of smooth ball movement, no temperature rise and low noise in high-speed operation of the screw pair.