The utility model provides a lock accuse device for a public service cart lease, including cavity umbrella face, the support column, the bracing piece, electronic jar two, slip collar, electronic jar three, electronic jar four, compresses the spring, pressure bar and backup pad, the assembly of cavity umbrella face is in the support column upper end, the support column is installed in two upper ends in the electronic jar, slip collar sets up on the support column, two bracing pieces of the last symmetry installation of slip collar, the assembly of bracing piece symmetry is at cavity umbrella face lower extreme, this design has realized keeping off the rain to the bicycle, three lower extremes in electronic jar installation electronic jar no. 4, pressure bar installs respectively at electronic jar no. 3 and four right -hand members in the electronic jar, the compression spring assembly is on pressure bar, the last backup pad of assembling of pressure bar, this design has realized twin lock accuse main part protection, the utility model discloses convenient to use, the operation of being convenient for, supported effects is good, can keep off the rain, and stability is good, and the reliability is high.