The invention relates to an automatic pressure-maintaining plunger-type slurry jacking pump capable of continuously discharging slurry in dual directions. The automatic pressure-maintaining plunger-type slurry jacking pump comprises a machine body, a motor fixed to the upper surface of the machine body, a driving wheel arranged on one side of the motor, piston rods arranged on two sides of the machine body, pump devices connected with the piston rods, slurry storage pressure maintaining devices connected with the pump devices on two sides by virtue of quick-connection rubber tubes, and a speed measurement metering device connected with the driving wheel by virtue of a conveying belt, wherein two sides of the machine body are provided with the piston rods and the pump devices; by virtue of linear movement of dual cylinders, the slurry is conveyed into the slurry storage pressure maintaining devices, so that continuous slurry discharge, stable slurry pressure, cleaning easiness and long service life are achieved; furthermore, pressed slurry amount can be automatically metered, so as to ensure that the amount of slurry in a pipeline conforms to the standard requirement, and the slurry discharge efficiency is greatly improved.