Multifunctional medical syringe

The utility model provides a multifunctional medical syringe and belongs to the technical field of medical instruments. The multifunctional medical syringe aims at solving the problems that a syringe head of the existing medical syringe is poor in interchangeability, and the existing medical syringe is single in function and inconvenient to use. A tee joint is connected onto the top of a liquid outlet pipe of a piston push-pull needle cylinder, a liquid outlet check valve is arranged on a straight port of the tee joint, a liquid outlet check valve cap is arranged on the liquid outlet check valve in a connection mode, inner threads formed in the liquid outlet check valve cap are in meshed connection with outer threads of a liquid outlet check valve seat, a pipe connector is manufactured on the liquid outlet check valve cap to be connected with the syringe head, a liquid suction check valve is arranged on a branch port of the tee joint, a liquid suction check valve cap covers the liquid suction check valve in a