In this paper,a novel phase-shifted photonic analog-to-digital conversion (PADC) scheme is presented. In order to realize the phase-shifted quantization,the phase difference between two polarizations is produced by press-induced birefringence in fiber squeezer. A 4-bit optical phase-shifted analog-to-digital system is demonstrated experimentally with 10 GS/s sampling rate,and 2.5 GHz sinusoidal electrical signal is sampled and quantized,achieving a signal-to-noise of 23.9 dB and an effective number of bits of 3.68 bits. Comparing with existing PADC methods,this scheme has a simple structure,and only needs one phase modulator,which avoids the problem of input signal synchronization;using the fiber squeezer as phase-shift module,the quantization resolution of higher than 6-bit can be achieved with high control precision and low cost;this scheme has the potential to realize higher sampling rate with optical pulses multiplex technology.