Cipher state database query method and device based on copy secret sharing

The invention discloses a secret database query method and device based on copy secret sharing, and the method comprises the steps: a user compiles a query demand into a secure multi-party calculation primitive under copy secret sharing and transmits the secure multi-party calculation primitive to a calculation layer, and the calculation layer requests a storage layer to share a table of data corresponding to the query demand; each data provider calls a Boolean replication secret sharing algorithm to generate a secret share and transmits the secret share to the calculation party; the calculation party calls a safe three-party calculation algorithm and performs safe three-party calculation by using one or more of a secret state filtering operator, a secret state connection operator, a secret state sorting operator and a secret state aggregation operator to obtain a secret sharing share of a calculation result in a secret sharing form and send the secret sharing share to the user; and calling a secret reconstru