The utility model relates to a plane nut synchronous handler. The plane nut synchronous handler comprises a ratchet (1), a handle (2), a bolt (3), a bottom plate (4), gear plate heads (5), a driving gear (7) and pawls (8) and is characterized in that: the bottom plate (4) of the plane nut synchronous handler has a double-layer disk structure, is connected by the bolt (3) and is provided with a crescent slot (A); the handle (2) is connected with the central ratchet (1); the ratchet (1) is provided with two symmetrical pawls (8); the ratchet (1) drives the driving gear (7); and the driving gear (7) is meshed with the 2 to 4 gear plate heads (5) to drive the gear plate heads (5) to rotate. The plane nut synchronous handler is simple in structure and easy to manufacture, and is conveniently, safely and reliably operated. When four plane nuts of a plane baffle of a hydraulic cylinder system of a polymer-injecting pump are assembled and disassembled, the plane nut synchronous handler saves time and labor, reduces maintenance time, improves the operation rate and the polymer-injecting efficiency of the polymer-injecting pump and increases the yield of crude oil.