The invention provides a low pass filter which is arranged on a substrate. The low pass filter comprises an input end, an output end, a first transmission part, a second transmission part, a capacitance element and an inductance element, wherein the input end is used for feeding in electromagnetic signals; the output end is used for feeding out the electromagnetic signals; the input end and the output end together form a reverse V shape and exhibit axisymmetric; the first transmission part comprises a first connection end and a first open end which are electrically connected with the input end; the second transmission part comprises a second connection end and a second open end which are electrically connected with the output end; the capacitance element is electrically connected with the first connection end and the second connection end; and the inductance element is electrically connected with the first open end and the second open end. The low pass filter has the advantages of good filter effect and small area.