In order to improve the flow characteristics of the valveless piezoelectric pump and improve poor pump processing technology, a valveless piezoelectric pump with taper pipe slopes element was developed. First, the valveless piezoelectric pump with taper pipe slopes element was proposed and designed, and its working principle was analyzed. Meanwhile, Ansys software was used to simulate the flow fields of the pump. The simulation results show that the pump has a function of transmission fluid. Finally, a valveless piezoelectric pump with taper pipe slopes element was produced using 3D printing technology, and the relationships between flow rate and driving frequency were experimentally investigated. Test results show that when the driving frequency was 8 Hz, the flow rate of the valveless piezoelectric pump with taper pipe slopes element reached a maximum of 26.8 ml/min, which is 18.6% more than that of the same sized valveless piezoelectric pump with slopes element under the same driving voltage. The experimental results showed that the flow characteristics of the valveless piezoelectric pump with taper pipe slopes element were superior to the pump with a slopes element. Thus, the processing technology on valveless piezoelectric pump was improved, the processing cycle was shortened, and the processing costs were reduced using 3D printing technology.