The invention provides a flexible piezoelectric energy collector and a manufacturing method thereof. The energy collector mainly comprises flexible copper electrodes distributed in parallel, electrostatic-spun P(VDF-TrFE) nanofibers and a polydimethylsiloxane casing for packaging. The manufacturing method of the energy collector mainly comprises the following steps: 1) the copper electrodes which are distributed in parallel at an equal interval are prepared on a copper-clad polyimide film with a wet etching method; 2) orderly P(VDF-TrFE) nanofibers are collected on surfaces of the flexible electrodes with a high-speed rotary plate collection method and a parallel electrode method; 3) the electrodes and the fibers are taken off together and are packaged with dimethyl siloxane after positive and negative electrodes are lead out with copper adhesive tapes. The flexible piezoelectric energy collector can have the peak-to-peak voltage value of 2V and the current value of 120 nA under the action of periodic external force. The energy collector is simple in structure, can collect mechanical energy wasted in external environments and in the human motion process and has wide application prospect in the field of wearable equipment in the future.