The invention belongs to the technical field of flowerpots, in particular to a flowerpot with a water supplement function. The flowerpot comprises a pot body, a pot edge is arranged on the circular side wall of the pot body, a plurality of first chambers and a plurality of second chambers are arranged on the inner wall of the pot body, the first chambers are in one-to-one corresponding to the second chambers, the first chambers are arranged in the pot body among the second chambers and the pot edge, air bags arranged on the top surfaces of the first chambers and can only vertically expand andcontract, the middle side walls of the air bags are fixedly connected with the inner walls of the first chambers, first arc-shaped piston plates are slidably and hermetically connected in the first chambers, the upper ends of the first arc-shaped piston plates are fixedly connected with the lower ends of the air bags, a water spraying opening is formed in the inner wall of one end, far away from the pot edge, of each second chamber, the water spraying openings approach to top surfaces of the second chambers, and third chambers are arranged on the inner wall of the pot body. The flowerpot can automatically supplement water for upper soil in high temperature weather of sun shine and has a sunscreen effect on planted young seedlings.