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Testing gravity by binary pulsars nowadays becomes a key issue. Screenedmodified gravity is a kind of scalar-tensor theory with screening mechanism inorder to satisfy the tight Solar System tests. In this paper, we investigatehow the screening mechanism affects the orbital dynamics of binary pulsars, andcalculate in detail the five post-Keplerian (PK) parameters in this theory.These parameters differ from those of general relativity (GR), and thedifferences are quantified by the scalar charges, which lead to the dipoleradiation in this theory. We combine the observables of PK parameters for theten binary pulsars, respectively, to place the constraints on the scalarcharges and possible deviations from GR. The dipole radiation in the neutronstar (NS) - white dwarf (WD) binaries leads to more stringent constraints ondeviations from GR. The most constraining systems for the scalar charges of NSand WD are PSR~B1913$+$16 and PSR~J1738$+$0333, respectively. The results ofall tests exclude significant strong-field deviations and show good agreementwith GR.

Constraints of general screened modified gravities from comprehensive analysis of binary pulsars