Intermittent automatic cycle lubricating system

The invention discloses an intermittent automatic cycle lubricating system which comprises a five-way solenoid directional valve with a first exhaust port and a second exhaust port, a cylinder body and a piston. One end of a piston rod is sleeved with a flange cover, the other end of the piston rod is fixedly connected with a nut, the flange cover is embedded in the cylinder body, the outer side of the piston rod is sleeved with a spring, a gasket is fixedly arranged between the spring and the nut, the spring is fixedly arranged between the flange cover and the gasket, a second cavity is defined by the flange cover, the piston and the inner wall of the cylinder body, the second cavity is communicated with the first exhaust port, an oil suction mouth and an oil discharge channel are arranged in the cylinder body, an inlet of the oil discharge channel is communicated with a first cavity in the cylinder body, an outlet of the oil discharge channel is communicated with the second exhaust port, and the second exha