In the layered asymmetric clipped optical orthogonal frequency division multiplexing (LACO-OFDM), the use of discrete Hartley transform(DHT) can makes up for the low spectral efficiency of fast Fourier transform (FFT), but there is still a problem of high computational complexity in the separation of multi-layer signals at the receiving end. Combined with the time-domain symmetry and anti-symmetry characteristics of the DHT-LACO-OFDM signal, a layered signal receiving method based on time domain reconstruction is proposed, in which the superimposed signal is received layered in the time domain. The results of the study show that, compared with the traditional iterative receiving method combining time-frequency domain, the layered signal receiving method based on time-domain reconstruction has almost the same bit error performance as the traditional iterative receiving method, but the computational complexity is reduced by half.