The invention discloses a multi-method combined particle size analyzer which is characterized in that a laser source, a non-monochromatic lighting source, a microobjective, a Dove prism or two 90-degree turning prisms or total reflection mirrors, a half transparent and half reflecting mirror, an array digital camera or a video camera, a sample cell and a lens form two light path structures, wherein one light path irradiates samples in the sample cell from the non-monochromatic lighting source, and an image magnified by the microobjective is transmitted to the array digital camera through the Dove prism and the half transparent and half reflecting mirror; and the other light path irradiates the samples in the sample cell from the laser lighting source, and the image magnified by the lens is transmitted to the array digital camera through the half transparent and half reflecting mirror. The multi-method combined particle size analyzer has the benefits of combining multiple measuring methods together by using one digital camera, expanding the upper limit and the lower limit of the particle size analyzer by using a simple structure, enabling the measurement range of the particle size analyzer to be from nanometer to hundreds of microns, meeting the requirement of wide-range size distribution measurement, and being capable of giving morphology parameters of particles by using the image method simultaneously.