A pair of portable hydraulic pliers for crimping bead string joints relates to a pair of portable hydraulic pliers and aims to solve the problems that no appropriate crimping operation tool is available for conventional crimping of bead string joints, a crimping force cannot be controlled within a reasonable range, and accordingly the connection between a bead string joint and a bead string is not stable. The pair of portable hydraulic pliers comprises a jaw, a pliers pump body, an oil inlet component, a compressing component, an oil draining component, a pressure setting component, an oil receiver, a main handle, a pressurizing moving handle, a pressure unlocking handle, a pressure measuring valve, an elastic load-bearing pin, crimping modules and pin shafts, wherein a first blind hole and a second blind hole are processed in two ends of the pliers pump body respectively; the oil receiver is sleeved with the main handle; the compressing component is mounted on the pliers pump body; the jaw is fixedly mounted on the compressing component; the crimping modules are mounted on the jaw in a sliding way; the pressure setting component is mounted in the second blind hole; the oil inlet component is mounted on the pliers pump body; and the oil draining component is fixedly mounted on the pliers pump body. The pair of portable hydraulic pliers is used in the field of crimping of bead string joints.