We present PandaX-II constraints on candidate WIMP-nucleon effective interactions involving the nucleon or WIMP spin, including, in addition to standard axial spin-dependent (SD) scattering, various couplings among vector and axial currents, magnetic and electric dipole moments, and tensor interactions. The data set corresponding to a total exposure of 54-ton-days is reanalyzed to determine constraints as a function of the WIMP mass and isospin coupling. We obtain WIMP-nucleon cross section bounds of $rm 1.6 times 10^{-41} cm^2$ and $rm 9.0 times 10^{-42} cm^2$ ($90%$ c.l.) for neutron-only SD and tensor coupling, respectively, for a mass $M_mathrm{WIMP} sim {rm 40~GeV}/c^2$. The SD limits are the best currently available for $M_mathrm{WIMP} > {rm 40~GeV}/c^2$. We show that PandaX-II has reached a sensitivity sufficient to probe a variety of other candidate spin-dependent interactions at the weak scale.
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