  Aims. Active galactic nuclei (AGNs) with EUV deficit are suggested to be
powered by a MAD surrounding the black hole, where the slope of EUV spectra
($\alpha_{\rm EUV}$) is found to possess a well positive relationship with the
jet efficiency. In this work, we investigate the properties of X-ray emission
in AGNs with EUV deficit for the first time. Methods. We construct a sample of
15 objects with EUV deficit to analyse their X-ray emission. The X-ray
luminosity in 13 objects are newly processed by ourself, while the other 2
sources are gathered from archival data. Results. It is found that the average
X-ray flux of AGNs with EUV deficit are 4.5 times larger than that of
radio-quiet AGNs (RQAGNs), while the slope of relationship between the
optical-UV luminosity ($L_{\rm UV}$) and the X-ray luminosity ($L_{\rm X}$) is
found to be similar with that of RQAGNs. For comparison, the average X-ray flux
of radio-loud AGNs (RLAGNs) without EUV deficit is about 2-3 times larger than
that of RQAGNs. A strong positive correlation between $\alpha_{\rm EUV}$ and
radio-loudness ($R_{\rm UV}$) is also reported. However, there is no strong
relationship between $L_{\rm X}$ and the radio luminosity ($L_{\rm R}$).
Conclusions. Both the excess of X-ray emission of RLAGNs with EUV deficit and
the strong $\alpha_{\rm EUV}$-$R_{\rm UV}$ relationship can be qualitatively
explained with MAD scenario, which can help to constrain the theoretical model
of MAD.
