A suction type bottle cap has a bottle cap and a suction device. The suction device comprises a vacuum draw bar, a liquid suction cavity, a piston and at least one suction pipe (5). The liquid suction cavity is connected with the bottle cap, the upper end of the suction pipe communicates with the liquid suction cavity, the lower end of the vacuum draw bar is placed in the liquid suction cavity, and the piston is arranged at the lower end of the vacuum draw bar. The suction type bottle cap can prevent liquid from polluting the bottle mouth so as to avoid unnecessary waste, is convenient for liquid suction and accurate in measurement, and is suitable for the suction of various liquids.