In order to apply the polarization spectral intensity modulation (PSIM) technology to the fields of outdoor polarization remote sensing, an integrated PSIM spectropolarimeter experimental prototype is designed based on the laboratory principle model. First, a modulator consisting of a Glan-Taylor prism and two quartz crystal retarders is integrated into a module. Then the module is mounted on the head of the grating spectrometer to realize integrated hardware design of the PSIM spectropolarimeter. Based on interactive data language (IDL), the functions of file accessing , data processing and result displaying are integrated into one unified interface to realize an integrated software design of the PSIM spectropolarimeter. Finally, the measurement capability of the experimental prototype is verified by measuring the whole Stokes vector element spectrum of horizontal and vertical linear polarized light, and the polarization calibration of the experimental prototype is accomplished by using polarization calibration system. Experimental data processing results show that experimental prototype can synchronously achieve the whole Stokes vector element spectrum of the testing light, and the maximum error between the measured results of the experimental prototype and the theoretical output results is about 0.003 for the degree value of polarization in full spectrum of the light from the polarization calibration box. It is indicated that the design goal of integrated experimental prototype is realized.