  Cosmic microwave background radiation (CMB) observations are unavoidably
contaminated by emission from various extra-galactic foregrounds, which must be
removed to obtain reliable measurements of the cosmological signal. In this
paper, we demonstrate CMB lensing reconstruction in AliCPT-1 after foreground
removal, combine the two bands of AliCPT-1 (90 and 150~GHz) with Planck HFI
bands (100, 143, 217 and 353~GHz) and with the WMAP-K band (23~GHz). In order
to balance contamination by instrumental noise and foreground residual bias, we
adopt the Needlet Internal Linear Combination (NILC) method to clean the E-map
and the constrained Internal Linear Combination (cILC) method to clean the
B-map. The latter utilizes additional constraints on average frequency scaling
of the dust and synchrotron to remove foregrounds at the expense of somewhat
noisier maps. Assuming 4 modules observing 1 season from simulation data, the
resulting effective residual noise in E- and B-map are roughly $15~\mu{\rm
K}\cdot{\rm arcmin}$ and $25~\mu{\rm K}\cdot{\rm arcmin}$, respectively. As a
result, the CMB lensing reconstruction signal-to-noise ratio (SNR) from
polarization data is about SNR$\,\approx\,$4.5. This lensing reconstruction
capability is comparable to that of other stage-III small aperture millimeter
CMB telescopes.
