Engine cylinder measuring tool

The utility model discloses an engine cylinder measuring tool which comprises the following components: a measuring device, a calibrating member and a standard member. The measuring device comprises a meter base which is a cylinder with a chamber. The cylinder is provided with a dial indicator. A measuring rod of the dial indicator is arranged in the chamber. A touch pin which can move vertically is arranged below a measuring head of the dial indicator. A spring is sleeved outside the touch pin. When the engine cylinder is measured, the measuring device is calibrated through the calibrating member; and then, a measuring mandrel of the standard member is inserted into a main shaft hole of the engine cylinder. The measuring device is placed into the engine cylinder through a cylinder hole on the surface of the engine cylinder. The touch pin contacts with the surface of the cylinder body of the standard member under function of the spring. An error between a standard dimension and a distance between the top surf