A certificateless multi-proxy signature method, comprising: computing, by a proxy signature device, a public key and a private key of the proxy signature device according to a public parameter, wherein the public key is corresponding to the private key; acquiring a verification result of a standard signature, and determining, according to the verification result, whether the standard signature is valid, wherein the standard signature comprises T and V, wherein T is obtained through computation by a standard signature computing device according to a formula T = rP, and V is obtained through computation by the standard signature computing device according to a formula V=D a + x a H 1 (m,T,P a) + rH 2 ( m,T,P a); computing a partial proxy signature of the proxy signature device according to the private key if the verification result is used to represent that the standard signature is valid; and sending the partial proxy signature to a proxy signature device administrator, so that after the proxy signature device administrator obtains a multi-proxy signature through computation according to the partial proxy signature, a multi-proxy signature verification device verifies the multi-proxy signature, wherein r is randomly selected from Z q * according to a formula r ∈ Z q *; a is a sequence number of the standard signature computing device and 0≤ a ≤ l, wherein l is a quantity of standard signature computing devices plus one; x a is a first sub-private key comprised in a private key of the standard signature computing device; D a is a second sub-private key comprised in the private key of the standard signature computing device; m is a message m input by a transmit end; P a is a public key of the standard signature computing device; and the public parameter comprises: H 1 (●), H 2 (●), and P, wherein P is a generator of G, and G is a group G whose order is a prime number q. computing, by a proxy signature device, a public key and a private key of the proxy signature device according to a public parameter, wherein the public key is corresponding to the private key; acquiring a verification result of a standard signature, and determining, according to the verification result, whether the standard signature is valid, wherein the standard signature comprises T and V, wherein T is obtained through computation by a standard signature computing device according to a formula T = rP, and V is obtained through computation by the standard signature computing device according to a formula V=D a + x a H 1 (m,T,P a) + rH 2 ( m,T,P a); computing a partial proxy signature of the proxy signature device according to the private key if the verification result is used to represent that the standard signature is valid; and sending the partial proxy signature to a proxy signature device administrator, so that after the proxy signature device administrator obtains a multi-proxy signature through computation according to the partial proxy signature, a multi-proxy signature verification device verifies the multi-proxy signature, wherein r is randomly selected from Z q * according to a formula r ∈ Z q *; a is a sequence number of the standard signature computing device and 0≤ a ≤ l, wherein l is a quantity of standard signature computing devices plus one; x a is a first sub-private key comprised in a private key of the standard signature computing device; D a is a second sub-private key comprised in the private key of the standard signature computing device; m is a message m input by a transmit end; P a is a public key of the standard signature computing device; and the public parameter comprises: H 1 (●), H 2 (●), and P, wherein P is a generator of G, and G is a group G whose order is a prime number q.