The invention relates to a lateral contact type electricity obtaining method. A third rail is additionally arranged on the side of two original rail lines, the head of the third rail faces towards a walking rail, the third rail is provided with a fitting, the fitting is provided with a contact screen composed of dual-lead contact lines, one side of the bottom of a train is provided with a fixing base, the fixing base is provided with a collector shoe, a shock absorbing device is arranged between the fixing base and the collector shoe, the collector shoe and the contact screen are connected in a lateral mode, and the contact portion of the collector shoe and the contact screen is of a single arm type. By means of the lateral contact type electricity obtaining method, the service life of the collector shoe is prolonged, current impact at gaps, turnouts and the like is reduced, and stability of a power supply system is guaranteed.