The invention discloses a line-field synchronizing signal generating device with adjustable resolution. Two line-field parameter registers are adopted to store line-field parameters in a default display mode and an adjustable display mode respectively, input of a port is selected according to the display mode at the top layer, and a corresponding line-field parameter is selected to be sent to a line-field synchronizing signal generating module; and a line signal counter performs counting to a clock, the field signal counter performs counting to the count cycle of the line signal counter, then according to the count values of the line signal counter and the field signal counter and the line-field parameters, high level or low level is output, and a line-field synchronizing signal and a data effective signal are obtained. According to the invention, FPGA (Field Programmable Gate Array) can be used to realize the line-field synchronizing signal generating device, Verilog language can be adopted to describe the two counters, judge modules adopt corresponding if statements to perform level judging according to count values so as to obtain the line-field synchronizing signal with adjustable resolution and the data effective signal, and the implementation logic is simpler and more intuitive.