The present disclosure provides a particle analyzer and a particle test control method and device thereof. The method comprises: after acquiring a diluted sample, preserving a part of the diluted sample, and monitoring whether a pore blocking event occurs during a counting process; when the pore blocking event occurs, suspending the test of the sample, and performing an unblocking operation; and after the unblocking operation is completed, controlling a liquid addition system to again acquire the preserved part of the sample from a reaction cell or a tube of the liquid addition system and inject it into a counting cell, and then re-counting the sample in the counting cell by an impedance method. The method makes full use of the residual diluted sample for a second test to eliminate the impact of pore blocking that occurs in the first measurement of the sample on the test result, and there is no need to be place the sample tube again at test position for re-acquisition and re-dilution, thereby reducing the probability of pore blocking.