The present disclosure relates to the technical field of microorganisms, in particular to Lactobacillus gasseri HMV18 and a secreted protein and an application thereof. The Lactobacillus gasseri HMV18 is preserved in the China Center for Type Culture Collection on Jul. 11, 2019 with a preservation number of CCTCC NO: M 2019538, and a preservation address of Wuhan University, Wuhan, China. The protein extracted from the Lactobacillus gasseri HMV18 has antibacterial and anti-tumor effects, but basically has no effect on normal myocardial cells, so the Lactobacillus gasseri HMV18 can be applied to preparation of antibacterial and anti-tumor products.