A switch rail heel end connecting structure of a comb-shaped turnout straight trip switch of a tramcar comprises a switch rail and a switch frame, a pivot is arranged at the heel end of the switch rail, and a first shoulder is arranged on the upper end face of the pivot; a second shoulder and a pivot hole are arranged on the table board corresponding to the pivot in the switch frame, and the firstshoulder and the second shoulder are equal in height; the first shoulder is located on the non-working edge side of the switch rail, and the second shoulder is located on the side close to the working edge of the switch frame. The pivot is inserted into the pivot hole, the pivot is axially limited in the pivot hole through pressing plates arranged on the first shoulder and the second shoulder, and rail protecting grooves are reserved between the working edge of the switch rail and the non-working edge of the switch frame and between the pressing plates and the working edge of the switch frame; the non-working edge of the sharp end part of the switch rail is a straight section parallel to the working edge of the switch frame, and after the switch rail is pulled open around the pivot, a guard rail groove is formed between the straight section and the working edge of the switch frame. According to the utility model, the interval size after the switch rail is pulled open is ensured.